In the summer season of 2010, whereas making ready for an extended analysis journey to Madagascar, the mathematician Ingrid Daubechies purchased a 50-inch flat-screen TV for her husband, so he might invite buddies over to look at Premier League soccer video games. After setting it up, the couple turned on a match, and whereas Daubechies’ husband, the mathematician and electrical engineer Robert Calderbank, turned transfixed by the motion, she received distracted. “Oh, wow!” she stated. “They use wavelets!”

Wavelets are versatile mathematical instruments that may be thought of as a zoom lens, making it potential to highlight the data that issues most in a picture. The telltale indicators of wavelets that Daubechies noticed have been on the area, pixelating at bigger scales, producing a fuzzy patchwork of inexperienced. “Look here,” she exclaimed. “You can see artifacts in the grass.”

“Yes, yes,” Calderbank replied. “Who cares about the grass?” He simply needed to look at the recreation.

A professor at Duke University, in Durham, N.C., Daubechies’ métier is determining optimum methods to characterize and analyze photographs and data. The nice mathematical discovery of her early profession, made in 1987 when she was 33, was the “Daubechies wavelet.” Her work, along with additional wavelet developments, was instrumental to the invention of image-compression algorithms, like the JPEG2000, that pervade the digital age. “Mathematical caricature” is how Daubechies generally describes the means digital photographs try to seize our actuality with exaggerated simplifications, decreasing what we see in the world to its important options by pixel proxies and different mathematical manipulations. Wavelets can allow computer systems to offer better decision — functioning, in a way, as human eyes naturally do, seeing extra element at the point of interest and leaving the relaxation of the view comparatively blurry. (Daubechies, it could be price noting, has a lazy proper eye, and her left eye isn’t nice, both.)

## One mathematician refers to the protean skills of her former adviser by describing Daubechies as ‘the Meryl Streep of mathematics.’

Calderbank’s amused indifference to the grassy pixelations properly illustrates the energy of wavelets: They discover the motion in a picture, the essential content material. Little is misplaced if the grass is blurry. But when a objective is known as again as a result of of a questionable offsides choice, viewers and officers need to see fine-grained close-ups of the contentious second.

Daubechies is most well-known as a pioneer of wavelets, however extra broadly, her scientific contributions over the final three many years have rippled out in all instructions from the area of “signal processing.” In mathematical phrases, as in widespread parlance, a sign is one thing that conveys data. Jordan Ellenberg, a mathematician at the University of Wisconsin-Madison who first met Daubechies in 1998 after they have been colleagues at Princeton, factors out that sign processing “makes up a huge proportion of applied math now, since so much of applied math is about the geometry of information as opposed to the geometry of motion and force” — that’s, it’s extra about the warp and weft of data than bodily issues in, say, fluid dynamics or celestial mechanics.

Daubechies has sought out all kinds of methods to have interaction in the digital transformation of society. She has carried out key analysis finding out analog-to-digital conversion know-how, and thru a tapestry of collaborations, she has introduced her mathematical insights to areas of examine together with web site visitors, evolutionary morphology (analyzing information collected from lemur enamel and bones, beginning with that Madagascar journey) and electrocardiogram abnormalities. Daubechies’ wide-ranging and collegial mind-set has amounted to one thing of a social motion, the Stanford statistician David Donoho says, with tasks giant and small that “send a beacon out.” He cites one of her more moderen ventures: fine-art conservation involving the Ghent Altarpiece — “The Adoration of the Mystic Lamb,” a 15th-century polyptych attributed to Hubert and Jan van Eyck, arguably amongst the most essential work in historical past. Time after time, Donoho says, Daubechies sparks analysis teams that sign: “This is a happening thing.”

Many accolades have adopted, together with Guggenheim and MacArthur fellowships. In 2012, when she turned a baroness (a title granted by Belgium’s King Albert II), she composed a motto for her coat of arms evoking wavelets: “Divide ut comprimas,” or “Divide so you can compress” — borrowing from the Latin “Divide ut regnes,” or “Divide so you can conquer.” In 2019, she acquired an honorary diploma from Harvard, alongside the German chancellor Angela Merkel (who occurs to have a doctorate in quantum chemistry).

And but at instances throughout her profession, Daubechies fearful about being an entire faux. And she nonetheless considers herself an oddball as a mathematician. “I came out of left field,” she says — she educated as a physicist earlier than migrating into arithmetic. “And I think there are people who feel left field is where I belong.” She doesn’t thoughts. She revels to find significant and sensible issues — and options — the place different mathematicians assume there are none. Indeed, she puzzles over any drawback she will discover, and he or she is at all times recreation to tackle the issues of others as effectively.

“I called her the deus ex machina adviser,” says Cynthia Rudin, a Duke laptop scientist who’s one of her former Ph.D. college students. “When you’re in the depths of despair, your project has crashed and burned and you have almost proven that what you’re trying to do is impossible, Ingrid comes along and pulls you out of the pit of doom, and you can keep going.”

**In the summer season** of 2018, when she turned 64, Daubechies threw herself a celebration in Brussels, about an hour away from her hometown in japanese Belgium. (Daubechies acquired American citizenship in 1996.) She selected to have fun that birthday — somewhat than her 60th or 65th — as a result of 64 is a extra compelling quantity. It is an influence of two (2, four, eight, 16, 32, 64, and so forth), and powers of two maintain particular sway in science, particularly in digital sign processing, during which binary patterns of zeros and ones encode data. In binary notation, the powers of two are significantly pleasing, as a result of all of them start with a one adopted by growing portions of zeros: 2 = 10, four = 100, eight = 1000, 16 = 10000, 32 = 100000. Daubechies, in the summer season of 2018, was turning 1000000.

Daubechies booked a venue, a caterer, a troupe of majorette dancers recognized for farce — after which at the occasion made a shock look in the baton-twirling cancan line, disguised in make-up and a tutu. Afterward, she did what a mathematician extra sometimes does to commemorate a particular birthday: She attended a convention in her honor. Three days of talks amongst college students and collaborators previous and current supplied delicacies to tickle her eclectic fancy: exploring how high-dimensional geometry is revolutionizing the M.R.I. trade; “going off the deep end with deep learning,” a kind of synthetic intelligence based mostly on synthetic neural networks; and investigating darkish matter and darkish power and gravitational waves. A typical denominator was wavelets, which facilitate the enlargement or compression of data (usually by powers of two).

In her latest fine-arts analysis, Daubechies has used wavelets as an intermediate software, extracting and simplifying a picture’s important options in preparation for extra in-depth evaluation. Per week earlier than her birthday convention, she attended the sixth worldwide workshop on picture processing for artwork investigation at the Museum of Fine Arts in Ghent, which featured the persevering with restoration on the famed altarpiece. Her work on this space started at the first “IP4AI” workshop, in Amsterdam in 2007, with a computational evaluation of Vincent van Gogh’s brushstrokes to characterize the “core” of the artist’s type and assist determine forgeries.

One of Daubechies’ desks at Duke University.Credit…Jeremy M. Lange for The New York Times

The Ghent Altarpiece’s 12 panels — collectively standing about 12 toes huge by 17 toes tall — have introduced a number of issues for conservators that Daubechies and her fellow mathematicians are serving to to unravel. One investigation entails a pair of double-sided panels depicting giant portraits of Adam and Eve on one facet, with smaller scenes painted on the different. When utilizing X-rayed photographs to evaluate harm, conservators have problem “reading” the intermingled photographs. After processing the visible data utilizing wavelets, Daubechies and her workforce deployed a deep neural community algorithm — sometimes used for facial recognition — to separate the content material of the X-rays. Another investigation explored whether or not a e-book depicted in a central panel is merely symbolic, with intentionally illegible squiggles for letters, or a replica of an precise textual content obscured by the craquelure, the internet of cracks in the paint. “I come up with a problem, she comes up with a solution,” Maximiliaan Martens, an artwork historian at Ghent University, stated at the workshop. “Usually, I get lost in the mathematics.”

The talks shortly turned technical — one talked about “disrobing Adam and Eve with the linear-osmosis model” — and there was heated debate about the advisability of utilizing synthetic intelligence to preserve iconic artworks. On the final day, Daubechies visited the altarpiece at St. Bavo’s Cathedral. “Whenever I come to Ghent, I always try to see it,” Daubechies advised me. She was baptized Catholic, and whereas she’s not non secular, she embraces what she calls a “feeling of spirituality.” But she will’t purpose that out — “and I don’t need to,” she stated. Peering up at the masterpiece by the hushed darkness, she commented that whereas stunning artwork offers an emotional delight and resonates spiritually, stunning arithmetic offers “a logical shortcut, an intellectual delight.”

Wavelets provide delight, as an example, as a result of they permit “sparsity” — they succinctly seize and characterize fine-grained element solely when it’s related or desired. “This feature is enormously helpful in a variety of A.I. and data-science settings,” says Rebecca Willett, a professor of laptop science and statistics at the University of Chicago. “By leveraging a sparse representation of a signal or image, computers can ‘learn’ from fewer examples, and data can be stored with fewer bits. Ingrid’s work is enormously significant on its own, and it also inspired a generation of researchers to explore new ways beyond wavelets to represent signals and images and develop new theory and tools that can better exploit sparse representations.”

Daubechies closed out the summer season of her 64th birthday at the Burning Man competition in Nevada’s Black Rock Desert. During a midnight lecture she defined how, as a mathematician working with an algorithm, she crammed in the altarpiece’s craquelure. “You do it mathematically the same way as an art conservator would do it visually,” she stated. After one algorithm identifies voids left by cracks, one other algorithm guesses, based mostly on the adjoining areas, what’s more likely to have been there. Through this course of (and with skilled interpretation by paleographers), the e-book got here into focus: a piece by the Italian theologian Thomas Aquinas. Daubechies concluded her speak with one other motto she oft repeats: “Math can help! As always!”

Daubechies at Burning Man, in Nevada’s Black Rock Desert, in 2018.Credit…Siobhan Roberts

At a deeper degree, nonetheless, it isn’t recognized what’s occurring inside machine studying’s black field. Systems that people can perceive and question would make the know-how extra clear, dependable and reliable. And to this finish too, Daubechies thinks arithmetic will help. Machine studying’s success — demonstrated maybe most strikingly with GPT-Three, the language-prediction mannequin that may write essays, reply trivia questions and compose laptop code, amongst different text-oriented duties; and AlphaFold, an artificial-intelligence know-how that, in its skill to foretell protein constructions, solved a 50-year-old “grand challenge” in biology — is one thing that Daubechies believes mathematicians and mathematically inclined scientists ought to attend to extra. “Machine learning works very well, and we don’t know why it works so well,” she says. “I consider that a challenge for mathematicians, to understand it better. If we do, it will go much further than if we don’t.” Usually, the argument is that stunning, pure arithmetic finally — in a yr, in a century — produces compelling functions. Daubechies believes that the cycle additionally turns in the wrong way, that profitable functions can result in stunning, pure arithmetic. Machine studying is a promising instance. “You can’t argue with success,” she says. “I believe if something works, there is a reason. We have to find the reason.”

**Coming of age** in the 1970s, throughout feminism’s second wave, Daubechies went off to the Free University in Brussels anticipating to be the finest. Since childhood, she had been intrigued by mathematical truths — when she couldn’t go to sleep, she computed the powers of two in her head. Despite her curiosity in math, she deliberate to check engineering; her father was a civil engineer. She liked making issues, together with patterns for her dolls’ clothes, remodeling flat materials into three-dimensional creations. And she was inquisitive about how equipment labored. But throughout a category go to to a civil-engineering division, the concrete constructions present process sturdiness testing appeared like “glorified Ikea.” She switched to physics. Her mom — who, Daubechies remembers, was bored out of her thoughts as a homemaker and so went again to school, studied criminology and located work as a youth-protection counselor — was aghast: “Physics! Engineering is a profession. Physics is like being an artist.”

Physics meant so much of math lessons. One classmate was Jean Bourgain (a winner in 1994 of the Fields Medal, the so-called Nobel Prize of arithmetic, who died in 2018). Daubechies shortly discovered that Bourgain was not less than her equal at math. When she realized he was superior, she promptly developed a crush: “He was the first boy I met who was smarter than I was.”

Daubechies did her Ph.D. at the Free University, however given her pursuits, the French American physicist Alex Grossmann, based mostly in Marseilles, turned one of her advisers. Not lengthy after, in the early 1980s, Grossmann and the French geophysicist Jean Morlet started utilizing strategies from quantum mechanics to check seismic traces, the wavy curves plotted by a seismograph. They coined the time period “wavelet” — in French, “ondelette,” which means “small wave.” Daubechies turned swept up in her adviser’s enthusiasm for tackling a brand new matter and forging a method that led to the new paradigm: wavelet principle.

## ‘When you’re in the depths of despair, your undertaking has crashed and burned and you’ve got virtually confirmed that what you’re making an attempt to do is not possible, Ingrid comes alongside and pulls you out of the pit of doom, and you may maintain going.’

In arithmetic, waves are basic and ubiquitous. The sine wave is a easy, periodic undulation, a mathematical idealization of waves present in nature: energetic seismic waves produced by earthquakes; sonic booms propagating by air; tsunamis spreading throughout water. “And even things that don’t have this wavy effect, things that are much more complex, can be constructed as a conspiracy of different waves,” Daubechies says. “You can build almost anything by combining, in clever ways, waves of different wavelengths.”

This concept dates again two centuries: In 1822, the French physicist and mathematician Joseph Fourier printed a paper outlining his analytical principle of warmth. (Fourier is credited with discovering the greenhouse impact.) He proposed that every one periodic capabilities — all periodic phenomena — may very well be understood as sums of sine and cosine waves. Throughout the 19th century, Fourier evaluation developed to incorporate wider lessons of phenomena, together with waves that change their form over time somewhat than repeating identically eternally. Fourier evaluation helped remedy issues in physics and engineering. But this method had its limitations: It couldn’t effectively deal with alerts with abrupt adjustments, like spoken language or footage with sharp edges and sudden transitions in luminosity. In the 20th century, scientists in disparate fields overcame these difficulties by growing instruments that coalesced into the mathematical principle of wavelets.

Wavelets, in essence, permit for bespoke representations of information, a flexible tailoring to the kind of data inside any given information set. They are extra adaptable; they’ll effectively and successfully seize these abrupt adjustments. Sometimes Daubechies offers a fancifully impractical musical metaphor to explain the distinction. For Fourier evaluation, she envisions a room full of hundreds of idealized tuning forks, every sustaining a uniquely assigned be aware indefinitely. When the tuning forks are struck, at simply the proper time and depth, and inside brief intervals of each other, the frequencies of their reverberations — “woooOOOooo, woooOOOooo, woooOOOooo” — mix and conspire to provide a rendition of Beethoven’s Ninth Symphony.

Wavelets, in contrast, are a extra refined symphony orchestra of tuning forks that every ring for a shorter time. They can, in a way of talking, learn and convey all the data contained in the musical rating: details about tempo and be aware period, and about much more granular nuances of musicality, like variations in the similar be aware on totally different devices, or the similar be aware on the similar instrument by totally different musicians, or the assault at the begin of a be aware, or the purity of tone held for bars at a time. “With wavelets you can decompose all that in an efficient way,” Daubechies says.

In 1984, nonetheless at the Free University, Daubechies turned a tenured analysis professor in the division of theoretical physics. With Grossmann’s encouragement, she had waded into wavelets the yr earlier than. She discovered that when asking “why” and “how” questions in sign evaluation, the solutions she got here up with, as she recalled in her Guggenheim assertion, “were often not the same as the standard ones, and in some cases my answers were better. This was exciting, of course, and led to my first work on wavelets.”

In May of following yr, she met Calderbank. He has labored in the realm of quantum computing since the starting, in the 1990s (he’s the “C” in CSS error correction); and he has made vital contributions to coding and data principle for wi-fi communications that assist billions of cellphones. Then employed at AT&T Bell Laboratories in Murray Hill, N.J., Calderbank was on a three-month trade to the math division of the Brussels-based Philips Research. He and Daubechies have been each extricating themselves from different relationships at the time, and by the finish of the three months they determined to provide a go of life collectively. She organized a stint as a visitor researcher at New York University’s Courant Institute of Mathematical Sciences, beginning in the spring of 1986. During the subsequent yr, she made her massive breakthrough, the Daubechies wavelet.

The puzzle that Daubechies solved was the best way to take a latest wavelet advance — a factor of magnificence, by the French mathematicians Yves Meyer and Stéphane Mallat, however technically impractical — and make it amenable to utility. To “put it on its head,” Daubechies would say, however with out making it ugly. As she stated in the Guggenheim assertion: “It is something that mathematicians often take for granted, that a mathematical framework can be really elegant and beautiful, but that in order to use it in a true application, you have to mutilate it: Well, they shrug, That’s life — applied mathematics is always a bit dirty. I didn’t agree with this point of view.”

By February 1987, she constructed the basis for what grew right into a “family” of Daubechies wavelets, every suited to a barely totally different activity. One key issue made her breakthrough potential: For the first time in her profession, she had a pc terminal at her desk, so she might simply program her equations and graph the outcomes. By that summer season, Daubechies wrote up a paper and, sidestepping a hiring freeze, secured a job at AT&T Bell Labs. She began in July and moved right into a home not too long ago purchased with Calderbank, whom she married after popping the query the earlier fall. (Calderbank had made it recognized there was a standing provide, however he resisted proposing out of respect for Daubechies’ declared opposition to the establishment of marriage.)

The ceremony was in May in Brussels. Daubechies cooked the total wedding ceremony dinner (with some assist from her fiancé), a Belgian-British feast of rooster with endive and Lancashire hotpot stew, chocolate cake and trifle (amongst different choices) for 90 friends. She had figured that 10 days of cooking and baking can be manageable, solely later to understand that she had neither sufficient pots and pans for the preparation nor fridge area for storage, to not point out different logistical challenges. Her algorithmic answer went as follows: Have buddies lend her the needed vessels; fill stated vessels and go them again for safekeeping of their fridges and for transport to the wedding ceremony. She inspired the extra gourmand friends to deliver hors d’oeuvres as a substitute of presents. Her mom, placing her foot down, purchased a military of salt-and-pepper shakers.

**Daubechies continued her** wavelets analysis at AT&T Bell Labs, pausing in 1988 to have a child. It was an unsettling and disorienting interval, as a result of she misplaced her skill to do research-level arithmetic for a number of months postpartum. “Mathematical ideas wouldn’t come,” she says. That frightened her. She advised nobody, not even her husband, till steadily her artistic motivation returned. On event, she has since warned youthful feminine mathematicians about the baby-brain impact, they usually have been grateful for the tip. “I could not imagine that I would ever have trouble thinking,” Lillian Pierce, a colleague at Duke, says. But when it occurred, Pierce reminded herself: “OK, this is what Ingrid was talking about. It will pass.” Daubechies’ feminine college students additionally point out their gratitude for her willingness to push for little one care at conferences, and generally even to tackle babysitting duties herself. “My adviser volunteered to entertain my toddler while I gave a talk,” a former Ph.D. scholar, the Yale mathematician Anna Gilbert, remembers. “She seamlessly included all aspects of work and life.”

In 1993, Daubechies was appointed to the school at Princeton, the first lady to grow to be full professor in the arithmetic division. She was lured by the prospect of mingling with historians and sociologists and their ilk, not solely electrical engineers and mathematicians. She designed a course referred to as “Math Alive” geared toward nonmath and nonscience majors and gave talks for the common public on “Surfing With Wavelets: A New Approach to Analyzing Sound and Images.” Wavelets have been taking off in the actual world, deployed by the F.B.I. in digitizing its fingerprint database. A wavelet-inspired algorithm was utilized in the animation of movies like “A Bug’s Life.”

“The Daubechies wavelets are smooth, well balanced, not too spread out and easy to implement on a computer,” Terence Tao, a mathematician at the University of California, Los Angeles, says. He was a Princeton grad scholar in the 1990s and took programs from Daubechies. (He gained the Fields Medal in 2006.) Daubechies wavelets, he says, can be utilized “out of the box” for all kinds of signal-processing issues. In the classroom, Tao remembers, Daubechies had a knack for viewing pure math (for curiosity’s sake), utilized math (for sensible objective) and bodily expertise as a unified complete. “I remember, for instance, once when she described learning about how the inner ear worked and realizing that it was more or less the same thing as a wavelet transform, which I think led to her proposing the use of wavelets in speech recognition.” The Daubechies wavelet propelled the area into the digital age. In half, wavelets proved revolutionary as a result of they’re so mathematically deep. But principally, as Calderbank notes, it was as a result of Daubechies, a tireless community-builder, made it her mission to assemble a community of bridges to different fields.

In due course, the awards started piling up: The MacArthur in 1992 was adopted by the American Mathematical Society Steele Prize for Exposition in 1994 for her e-book “Ten Lectures on Wavelets.” In 2000 Daubechies turned the first lady to obtain the National Academy of Sciences award in arithmetic. By then she was mothering two younger youngsters. (Her daughter, Carolyn, 30, is a knowledge scientist; her son, Michael, 33, is a highschool math instructor on Chicago’s South Side.) And by all appearances she was handily juggling all of it.

But regardless of her many successes, she was incapacitated by insecurities — generally she might barely get out of mattress. At 40, after a tough interval, she discovered assist and was lastly recognized with continual despair, having suffered darkish episodes since puberty. Through remedy and drugs, she discovered a manageable equilibrium. “When I’m busy and happy, I feel I don’t need the medication,” she advised me at Burning Man, the place the profusion of radical creativity brought on her to almost overlook her capsules greater than as soon as.

During the pandemic, one significantly mood-elevating undertaking has been “Mathemalchemy,” a collaborative math-art set up that opens in January at the National Academy of Sciences in Washington. As Daubechies’ husband advised her, “You found a way to do Burning Man at home” — albeit by way of an estimated 334 hours of digital conferences and seven,582 emails amongst a workforce of 24.

A element of the “Mathemalchemy” set up, which opens in January at the National Academy of Sciences in Washington.Credit…Jeremy M. Lange for The New York Times

“But it’s always a bad idea to skip,” Daubechies says of her treatment, as a result of inside a day, she begins sliding. She doesn’t thoughts speaking about despair, partially as a result of she believes it’s good for folks to know that success doesn’t inoculate in opposition to mental-health vulnerabilities and that it’s a continual drawback requiring continual fixing. “It’s never really solved,” she says. “That is the case with many, many things. There is no static equilibrium.” She likens it to bicycling: “You have to compensate, all the time.”

**In 2010, Daubechies** and Calderbank moved to Duke University, the place he’s now a professor and the director of the faculty’s Information Initiative. The similar yr, she was elected president of the International Mathematical Union — one other feminine first — and on her watch, in 2014, the I.M.U. awarded the Fields Medal to Maryam Mirzakhani, its first feminine recipient, following greater than 50 male winners (Daubechies served as chairwoman of the medal committee). In 2014, the University of Cambridge tried to rent each Daubechies and Calderbank. Daubechies was supplied the Lucasian Chair of Mathematics, held beforehand by, amongst others, Stephen Hawking and Isaac Newton — however by no means by a lady. Duke efficiently counteroffered: The provost assured funding to recruit and rent feminine mathematicians till they made up 30 p.c of the school. This is a data-driven goal: Surveys by the American Mathematical Society point out that at universities with R1 standing, the highest analysis classification, girls represent about 30 p.c of math Ph.D. college students, however solely about 17 p.c of the tenured or tenure-track school.

Daubechies, for her half, has been unaware of biases affecting the trajectory of her profession (although she admits to being oblivious to the subtleties of social alerts). But from a societal perspective, the gender hole in math (and science) is a mere sampling of the incontrovertible fact that, based on a United Nations report that arrived in her inbox in March final yr, 90 p.c of the world’s inhabitants has a “deeply ingrained bias against women.” For 2020, Duke’s hiring committee made provides to 5 girls — “the Fab Five,” Daubechies calls them. Only two accepted; the shortage of feminine candidates makes for fierce competitors. One of them, Jessica Fintzen, first met Daubechies at Duke, although she knew her work. “She’s a role model as a very successful female mathematician,” Fintzen says. “You need to have a certain character to ignore the biases and survive.”

Countering underrepresentation is tough and fraught, however there may be additionally the inextricable problem of going through down express sexism. For many years, the customary take a look at picture in the sign processing neighborhood was an image, cropped to a headshot, of Lena Forsen, a Playboy centerfold mannequin in 1972. Wearing a feathered hat and looking out over a naked shoulder, Forsen made repeat appearances on convention screens and in papers. Even Daubechies used the photograph for a time, unaware of its origins. But round the flip of the century, in solidarity with rising opposition to the image, she swapped in one other picture that she nonetheless makes use of at this time: When she offers a chat explaining the essence of wavelets, her slides present 4 more and more blurry copies of a sailboat photograph (the message being that even at the coarsest scale, the picture nonetheless incorporates helpful data). The notorious “Lena” image was nonetheless the go-to take a look at picture in the late 2000s, when the utilized mathematician Rachel Ward, now a professor at the University of Texas at Austin, did her Ph.D. with Daubechies. (Ward refers to the protean skills of her former adviser by describing her as “the Meryl Streep of mathematics.”) In 2013, Ward and a co-author printed a paper that as a substitute used a headshot of Fabio Lanzoni, the Italian vogue mannequin and actor. “As young, untenured professors,” Ward says, “we felt the only way we could make a statement was through parody.”

Daubechies has additionally seen discrimination whereas serving on hiring and jury committees, and often means that transgressors take an implicit bias take a look at, as she has carried out herself greater than as soon as. Her tendency till not too long ago was to let minor situations go along with an eye-roll and maybe a figuring out look to her colleague Lillian Pierce. But then she and Pierce had a dialog about these predicaments, and Daubechies concluded that passive exasperation was sending the mistaken message. “I realized that as a more senior woman, my responsibility was to stand up,” she says. She took a course at Duke referred to as “Moving From Bystander to Upstander.”

Daubechies and Pierce first met at Princeton. An undergraduate at the time, Pierce was in the behavior of typing up her analysis in a pc lab that was at all times empty. One day an workplace administrator advised her that the lab was for grad college students solely and that she needed to get out. “I was petrified and horrified that I had done something wrong,” Pierce says. “Then I heard a voice behind me saying, ‘Give her a key!’ I don’t think I had seen Ingrid in person before that moment. But it’s classic Ingrid in that she believes in enfranchising people. And if people want to do math, they should be given the key.”

The advocacy generally generates pushback. A pair of years in the past, serving on a nationwide award committee, Daubechies backed the nomination of a superb midcareer feminine mathematician as a substitute of an older male who ended up the winner. The episode made Daubechies offended, and it introduced on a interval of discouragement and pessimism: “Somehow, I just felt tired. Tired of the struggle to show that women can be great mathematicians, too, and are often undervalued.” Maybe, Daubechies thought, she had been residing beneath a delusion, imagining that her efforts and people of others might have any actual impact. “It is a puzzle to myself as well, to feel this way — defeatism is not something I have a lot of experience with,” she says. “In fact, it was the major topic of my most recent therapy session!”

More characteristically, Daubechies redoubles her efforts — maybe following some cathartic weeding in her backyard — and perseveres. After all, she is the oddball mathematician who got here out of left area and prevailed. At a giant math convention not too way back — the final she attended in individual earlier than the pandemic — Daubechies overheard a joke that she retold a number of instances on the means residence. Somehow, it appears apropos: “I don’t get even,” she stated. “I get odder.”

**Siobhan Roberts** is a Canadian journalist and senior editor at MIT Technology Review. Her newest e-book is “Genius at Play: The Curious Mind of John Horton Conway.” She is presently engaged on a biography of the mathematical logician Verena Huber-Dyson, forthcoming from Pantheon. **Jeremy M. Lange** is a photographer and filmmaker in Durham, N.C.