Month: April 2025

Kateryna Marynets

Kateryna Marynets

Born in Uzhhorod, Ukraine • Birth year 1988 • Studied Applied Mathematics at Uzhhorod National University in Ukraine • Highest Degree PhD in Differential Equations from Taras Shevchenko National University of Kyiv in Ukraine • Lives in Delft, The Netherlands • Occupation Assistant Professor in Applied Mathematics at Delft Institute of Applied Mathematics, Delft University of Technology

4 countries, 5 languages, and 1 mathematics…

Was it my big dream to pursue a career as a math professor? No, it wasn’t. In fact, when our primary school teacher asked who we wanted to become in the future, I said that I wanted to be a pediatrician. But that was only because my parents are doctors, and my grandmother was leading the children’s department in the hospital at that time. To be honest, medicine has never been my thing—but as a kid, you tend to take on the role models you see around you. And I wasn’t an exception.

Many years have passed, and mathematics and languages have become inseparable parts of my life.

In Ukraine, we say that children inherit the talents of their grandparents. And with my grandparents working in the fields of physics and mathematics, following that logic, I was probably predestined for these directions. Interestingly enough, those were indeed my favorite subjects at school. I really enjoyed solving math puzzles and diving into the laws of physics. I was extremely lucky to have great teachers who recognized my interest and kept me engaged by offering challenging problems—even though my school had a linguistic focus, and the sciences didn’t occupy much of our curriculum. Many years have passed, and mathematics and languages have become inseparable parts of my life. Those seemingly different disciplines have a lot in common: languages help in sharing my mathematical expertise to a multilingual community, and logical thinking, developed through solving mathematical problems, helps in mastering a new language.

Obtaining a PhD brought new opportunities, but it also came with a lot of pressure—pressure to deliver, pressure not to disappoint.

The path to my current position was long and quite “nonlinear”—just like the math problems I work on. In my last year of high school, I seriously considered studying international economic relations, with applied mathematics as a second option. It was the study program where I could combine my passion for mathematics and foreign languages. But in the end, I chose applied mathematics, and I’ve never regretted the decision I made.

After graduation, I was offered a teaching position at my home university, which I combined with enrollment in a doctoral program. I studied boundary value problems for systems of nonlinear differential equations and developed iterative methods for approximating their solutions. It was a great combination of analysis and work with mathematical software—something I still enjoy doing. Back then, I could conduct research at my home institution but had to defend my thesis at a different university. I still remember all those trips to Kyiv, accompanied by my parents, who helped me organize everything…I am incredibly thankful for all their patience and time that they have invested.

Obtaining a PhD brought new opportunities, but it also came with a lot of pressure—pressure to deliver, pressure not to disappoint. Since then, sports has become my first aid when I feel overwhelmed and need to change my focus during the intense periods at work.

[Fractional differential] equations are broadly used in porous media modeling and systems with memory

After graduation, and having 3 languages ‘in my pocket’, I continued teaching at my home university for a couple of years but felt an urgent need for change. I seriously considered switching to industry and even received an offer from an IT company, but something held me back. Around that time, I won an individual grant for a short-term research stay in Slovakia, where I was introduced to a new field—fractional differential equations. These equations are broadly used in porous media modeling and systems with memory. Moreover, they are able to capture more complex dynamics of a physical system in comparison to their integer-order counterparts. Back then it was still a completely unfamiliar topic for me, something I had never worked on before, but it eventually became part of my current research profile.

My time in Bratislava was a period of reflection, and it gave me the motivation to continue pursuing an academic career. I saw many opportunities that European universities offered and started applying for postdocs. Among all the negative responses and unanswered emails, there was one that changed my life. I got a postdoc position in Vienna, which I still consider my biggest achievement to date. It might sound silly but moving from Uzhhorod, that is by the way famous for its Japanese cherry blossom, to join one of the oldest and most prestigious universities in Austria was something I couldn’t have even dreamed of!

Picture of a Japanese cherry blossom

During my postdoc, I explored real-world applications of differential equations by analyzing mathematical models related to ocean and atmospheric circulation

During my postdoc, I explored real-world applications of differential equations by analyzing mathematical models related to ocean and atmospheric circulation. I was fascinated by the opportunity to apply my mathematical training to real-world phenomena, expanding my knowledge beyond purely theoretical research. As time passed and my postdoc was nearing its end, I realized I needed something more permanent. And again, I stood at a crossroads: should I switch to industry and stay in Austria with my partner, or pursue a career in academia but accept the fact that I would likely have to move to a third country within the last three years? I know many couples for whom cross-country moves didn’t work out, and in the meantime I was already fluent in German and had good chances on the Austrian labor market. Luckily, my partner was incredibly supportive, and when I got an offer from TU Delft, he did everything he could to make my decision easier.

And here we are. Five and a half years after moving, I’m now a tenured assistant professor at one of the best universities in the Netherlands, developing my own research line in nonlinear (fractional) differential equations with applications in geosciences, speaking my fifth language, and making future plans with my husband. Time has sorted out everything, and despite all difficulties I feel that I am in the right place.

Of course, at the end of the day it’s all about hard work, determination and family support —but sometimes, it’s also about that one email that changes everything in your life.

Published on April 23, 2025.

Photo credit: Kateryna Marynets

Posted by HMS in Stories
JoAnne Growney

JoAnne Growney

Born in rural Pennsylvania in 1940 • Studied PhD in Mathematics at University of Oklahoma, United States • Lives in United States • Occupation Taught mathematics at Bloomsburg (PA) University (now part of Commonwealth University); now retired

Before I was a math girl, I was a farm girl – the oldest of three children growing up on a farm in Pennsylvania —  the one who went to the barn with her father while her mother took care of the little ones.

Math (often numbers and counting) was an inconspicuous but central part of farming – counting eggs as I collected them from beneath the hens, counting the sheep as they came into shelter at night to make sure that none had drifted away.  Geometric quantities also were important – the volumes of harvested grains and fruit, the distances between parallel rows of corn, the gallons of milk expected from our Guernsey cow which I milked morning and evening.

My teacher, a graduate of an elite college and unashamed of her math ability, was an energetic and supportive example of “girls can do math.”

Perhaps my farm experience helped me to be good at math – and that skill seemed fine in elementary school years but as my classmates and I moved through high school my female math ability seemed to make people turn away from me.  In my senior year, I was one of only three girls in my math classes.  BUT that year I also had an inspiring experience.  My teacher, a graduate of an elite college and unashamed of her math ability, was an energetic and supportive example of “girls can do math.”

Receipt of a scholarship from Westminster College in New Wilmington, Pennsylvania, enabled me to go away from home to continue my education.  (To my dismay, at Westminster I had several “only girl in the class” experiences.)  I started out as a chemistry major but, during my sophomore year. I learned that my “science scholarship” could be used toward a math major and then (preferring math to chemistry) I switched, combining studies of math with secondary education. AND I took creative writing courses and had work published in the campus literary journal. In those days (early 1960’s), many jobs were not available to women – but teaching was.

Graduation from Westminster led to marriage, to secondary school teaching in the Philadelphia area, to evening graduate classes at Temple University – from which I obtained an MA in Mathematics.  My husband (Wallace/Wally) – who had studied physics and math and a bit of computer science – took a job at Susquehanna University in Selinsgrove, PA.  I did some part-time teaching at Susquehanna and at nearby Bucknell – but soon we moved to Norman, Oklahoma where Wally would pursue a doctorate so that he could qualify for tenure at Susquehanna. While we were in Oklahoma, with lots of time on my hands, I was able to attain a teaching assistantship and continue my studies also. 

One of the requirements for mathematics professors at Bloomsburg University was to teach “general education” courses for non-majors and this experience led me to write and publish a textbook entitled Mathematics in Daily Life – a book containing material that engaged students in mathematical reasoning related to counting, voting, travel, decision-making, and other frequent concerns. 

Graduate school brought complications to our marriage. In our earlier studies, I had gotten better grades but we credited it to his sports and fraternity activities – AND, I studied more carefully. But at The University of Oklahoma, it became evident that I was the better student and, eventually, that caused stress for both of us. I became his helper. We studied together. During our work on dissertations, I became pregnant. When our doctoral studies were completed, we returned to Pennsylvania, bringing with us a baby daughter.  I secured a tenure-track position at nearby Bloomsburg State College (now part of Commonwealth University).  AND I was able to keep my on-campus schedule to three days per week and to find excellent child care; our care-giver, Erma, was loving and dependable. Our family grew with another childbirth and two adoptions.

Keeping busy helped our marriage survive but over time we began to recognize that things weren’t working and weren’t repairable. This eventually led to divorce and to me and the kids moving to the town of Bloomsburg (and to me avoiding the 30-mile commute).  My time in Bloomsburg involved congenial colleagues, a great neighborhood – a safe place for my children even if I was not with them and walk-to schools.  When my children grew up – and left home for college and marriage and  . . . I found time to revive my childhood interest (begun as a child reading Robert Louis Stevenson’s A Child’s Garden of Verses) to poetry.

One of my favorite poems celebrates the mathematician, Amalie Emmy Noether;  it’s title is “My Dance is Mathematics”

One of the requirements for mathematics professors at Bloomsburg University was to teach “general education” courses for non-majors and this experience led me to write and publish a textbook entitled Mathematics in Daily Life – a book containing material that engaged students in mathematical reasoning related to counting, voting, travel, decision-making, and other frequent concerns.  Work on this project and — even more so — my interest in poetry drew me into connections with other colleagues (in English and Philosophy and . . . and I gradually began to participate in poetry events and publication in addition to my math-related activities.

Writing poetry was an activity that I much enjoyed – and many of my poems incorporate mathematical ideas.  One of my favorite poems celebrates the mathematician, Amalie Emmy Noether;  it’s title is “My Dance is Mathematics” and it is available online at this link:   https://joannegrowney.com/ChapbookMyDance.html ;  here is its opening stanza:

They called you der Noether, as if mathematics

was only for men.  In 1964, nearly thirty years

past your death, at last I saw you in a spotlight,

in a World’s Fair mural, “Men of Modern Mathematics.”

Once my kids were grown – and using some funds inherited from a great aunt – I began to engage in travel-related math-and-poetry activities.  Via “Teachers for Tomorrow” – a non-profit organized by one of my high school friends – I spent part of several summers teaching (math and poetry and English conversation) – in India and in Romania. 

A few years into retirement, I moved south to the Washington, DC area where three of my four children were living with their young families.  And I am still here!

More can be learned about me at my website: https://joannegrowney.com. In 2010 I began to write a blog entitled “Intersections – Poetry with Mathematics” (found at   https://poetrywithmathematics.blogspot.com/) – and, with more than 1600 posts so far, my blogging continues.  My own thought processes seem to follow the rule that “everything connects” – and this article shares some related ideas:  https://joannegrowney.com/Everything-Connects–JMA-Growney-26June2020.pdf

THANK YOU for reading!  I hope you also enjoy math and poetry and their connections!

Image credit: Diann Growney Harrity

Posted by HMS in Stories