**Instructors**

**Simon Rubinstein-Salzedo** is the founder and main teacher at Euler Circle. Simon received his PhD at Stanford University in 2012 under the direction of Akshay Venkatesh in algebraic number theory. He has done research in many areas of mathematics, including number theory, algebraic geometry, combinatorics, game theory, probability, and complex analysis. Before founding Euler Circle, Simon taught mathematics at Stanford University and Dartmouth College.

In addition to his teaching at universities, Simon has been teaching mathematics to advanced middle-school and high-school students for over a decade and is extremely popular among his students. He is currently the lecturer for Program II at the Stanford University Mathematics Camp (SUMaC), where he teaches algebraic topology. He has worked at The Art of Problem Solving and has taught at many math events and run many math circles in the Bay Area. He is also the coach of the San Francisco Bay Area ARML team, which won the national championship for three consecutive years. His greatest claim to fame in life is probably having a factoring trick named after him.

Simon has also successfully directed mathematics research projects for high-school students, leading to five original papers coauthored with students so far, and more projects are currently in progress. His papers can be found on his website. Please contact him at simon@eulercircle.com.

Outside of mathematics, Simon is also an avid musician, chess player, and calligrapher.

**Teaching Assistants**

**Aaron Kaufer** is a junior at Stanford studying mathematics and computer science. He is interested in algebra and number theory. He loves tutoring and works as a peer tutor for Stanford’s math department. He has done research in commutative algebra and written a paper and given a talk on his results. Outside of math, he likes archery and Rubik’s cubes.

**Alice Yang** is an undergraduate senior at Stanford studying mathematics. Her interests include areas in probability and optimization/dynamical systems. She has previously taught students in both competitive and non-competitive math. Outside of math, she enjoys playing and listening to music.

**Annie Chen** is an undergraduate at Stanford University studying mathematics. Her interests include analysis, probability, and combinatorics. She has done research in arithmetic dynamics and probability theory and has written a paper and given a conference presentation on her work. In addition, she has previously tutored many advanced middle and high school students in math. In her free time, Annie enjoys playing tennis and card games.

**Ben Heller** is an undergraduate at Stanford studying mathematics. His interests range over virtually all branches of math, but has a soft spot for mathematical logic, analysis, and differential topology. He has done research in probability theory and has experience tutoring undergraduates in the Stanford math department’s peer tutoring program. Aside from math, he enjoys tinkering with Linux and listening to music.

**Eric Frankel** is a sophomore at Stanford studying mathematics. He is interested in analysis, probability, combinatorics, and dynamical systems, and has done research in probability theory. Eric is a board member on Stanford’s Math Organization and has tutored students in competitive and non-competitive math. Outside of math, Eric likes exercising, eating, coding, and getting bad haircuts.

**Eyob Tsegaye** is a junior at Stanford studying mathematics. His interests include algebra and combinatorics. He has research experience in additive combinatorics, probability theory, and finite group theory. Additionally, he has previously tutored several high schoolers. Outside of math, he enjoys reading, listening to music, and playing smash bros.

**Gautam Manohar** is a freshman at Stanford studying mathematics. He enjoys analysis, differential equations, and number theory. He is also interested in mathematical writing and communication, as well as computer science, especially algorithms and data structures. In his free time, he likes learning languages, following basketball, and writing.

**Javier Echevarría** is a senior at Stanford University studying mathematics and computer science. He is interested in partial differential equations, differential geometry, and mathematical physics. Besides grading undergraduate level courses, he has also been a tutor for fellow students ever since high school. In his free time, he enjoys swimming and playing the piano.

**Jaydeep Singh** is a senior at Stanford studying mathematics. He is interested in the intersections of mathematics and physics, as they manifest in probability, PDE, and geometric analysis. He has research experience in mathematical general relativity and gauge theory, and has worked as a calculus peer tutor at Stanford. Outside of school, he enjoys baking, playing tennis, and listening to music.

**Karen Ge** is an undergraduate at Stanford who hopes to improve mathematics education. She is interested in areas of number theory, algebraic topology, and cryptography. Karen has extensive experience tutoring and coaching in both competitive and non-competitive math. Outside of math, she loves playing ultimate frisbee, being swept away by the wonders of orchestral music, and writing poetry.

**Katy Woo** is a senior studying mathematics. She is interested in and has done research in number theory and cryptography. She was the president of Stanford’s student math organization and is currently a peer adviser for the math department. She has also been a counselor for Stanford University Mathematics Camp and a course assistant for a cryptography class in the CS department. Outside of math, she enjoys dancing and origami.

**Mateo Attanasio** is an undergraduate at Stanford studying mathematics. His interests include algebra, number theory, and topology. He has experience as a peer tutor in the Stanford maths department. Outside of mathematics, interests include rock climbing and history.

**Nik Castro** is a senior at Stanford studying mathematics. His interests include real analysis, probability, algebraic topology, and algebraic number theory. He has graded for both undergraduate and graduate level courses, and was a counselor at the Stanford University Mathematics Camp. Outside of math, he enjoys practicing martial arts.

**Nina Zubrilina** is an undergraduate at Stanford studying mathematics. She enjoys combinatorics, analytic number theory, analysis, geometry and anything having to do with sphere packing. She has done research in combinatorics and number theory and has written four papers on her work.

Besides Euler circle, her teaching experience includes being a TA for other math circles, TAing a class in Moscow High School #57, being a counselor and TA in a summer math camp, and giving a series of lectures in the Moscow Branch of the Higher School of Economics.

**Nitya Mani** is an undergraduate studying mathematics at Stanford University. She is excited about problems in algebraic number theory and extremal combinatorics and has done research in both areas. Some current areas she is learning more about include geometric measure theory and local class field theory. In addition to being a teaching assistant at Euler Circle for the past 3 years, Nitya coordinates the student peer tutoring program for the Stanford mathematics department and has graded many Stanford math classes.

**Niven Achenjang** is a senior at Stanford, studying mathematics. His mathematical interests include algebraic number theory, algebraic topology, and complex geometry, and he has published research in number theory. At Stanford, he has graded for and tutored students in math classes, as well as been a counselor and TA for the Stanford University Mathematics Camp. Outside of math, Niven enjoys video games, sports of all kinds, and performing with the Stanford Jump Rope Team.

**Quinn Greicius** is a senior at Stanford studying mathematics. He is interested in algebraic geometry, number theory, and algebraic topology, and has done research on Galois representations arising from abelian varieties. He has previously taught classes in algebra and number theory for advanced high schoolers in the Bay Area. In his free time, Quinn enjoys playing the piano, reading, and playing soccer.

**Rachana Madhukara** is an undergraduate at MIT studying mathematics. She is primarily interested in elementary and analytic number theory and has research experience in these areas. Outside of math, Rachana likes going to escape rooms, rock climbing, cooking, and traveling.

**Ryan Smith** is a master’s student in computer science at Stanford. His interests are in cryptography, computational complexity theory, and algebraic number theory. He has TA experience at the Stanford University Mathematics Camp as well as the computer science department at Stanford. Outside of math he enjoys reading, musical theater, and games of all kinds.

**Sawyer Dobson** is an undergraduate student at Stanford studying mathematics. He is primarily interested in number theory and cryptography, and he has experience writing problems for math competitions. Before coming to Stanford, he taught his high school math club in San Francisco. Outside of math, Sawyer enjoys programming, playing volleyball, and playing board games.

**Shardul Chiplunkar** is a ’22 undergrad at MIT studying mathematics and computer science. His mathematical interests include logic, formal systems, theory of computation, and programming language theory; his other academic interests include linguistics and computational cognitive science. He is currently doing research in formal verification and program synthesis. He also enjoys listening to and creating music (especially Hindustani classical), teaching, and spinning fire.

**Sherry Sarkar** is a senior computer science major from Georgia Tech. Her research interests are combinatorics, theoretical computer science, and discrete geometry. She has several papers and conference talks in these areas. Sherry also has TAed several math and CS courses at Georgia Tech. Outside of research, she boulders and watches anime.

**Sonia Chu** is a freshman at Stanford University. She’s interested in a wide variety of areas in math, along with interdisciplinary studies between math and other fields. Sonia has taught students ranging from elementary school to high school, in both competition and non-competition math. In addition, she has authored lab manuals for college cryptography courses. Outside of math, she enjoys reading, playing the clarinet, and skiing.

**Tim Wu** is an undergraduate at Stanford studying mathematics. His interests include number theory, combinatorics, and graph theory, and he has done research in graph theory. Before joining Euler Circle, Tim ran and taught a math circle back home in Michigan. Outside of math, he enjoys listening to music and trading stocks.

**Tyler Shibata** is a sophomore at Stanford studying mathematics. Though his mathematical interests span a variety of branches, he particularly enjoys studying linear algebra, stochastic processes, and real analysis. Despite having no formal interest in mathematics prior to college, he fell in love with the motivations behind certain topics after watching some inspiring 3Blue1Brown videos. Outside of math, he likes to cox for Stanford Men’s Rowing, cook and eat delicious foods, and play the saxophone.

**William Xi** is an undergraduate at Stanford studying mathematics and computer science. He is interested in all kinds of mathematics, especially algebra, number theory, and combinatorics. He has tutored students over the years in both competitive and non-competitive math and has graded for several online math classes. Outside of math, William enjoys coding, physics, playing basketball, and eating.

**Yelena Mandelshtam** is a senior at Stanford studying mathematics. She has been a TA at Euler Circle since 2016, and was a TA at the Euler Camp in Irvine in winter 2017-18. In addition to Euler Circle, Yelena has experience teaching a math circle at her Russian school when she was in high school, being a counselor at the Stanford University Mathematics Camp, and tutoring students individually. Her primary research interests are combinatorics and analysis. She has done research in mathematical biology, combinatorics, and ergodic theory and has written five papers on her work. Outside of math, Yelena enjoys rock climbing, playing board games, and reading and writing poetry.

**Yuzu Ido** is a sophomore at Stanford studying mathematics and music. She is interested in multiple areas of math, currently with an emphasis on algebra. She has done research on integer forms and elliptic curves and is a peer tutor for the Stanford Undergraduate Mathematical Organization. Outside of math, she enjoys making music, taking interesting courses in a variety of subjects, and eating good food.

**Zoe Himwich** is a math major in her senior year at Stanford. She has been a TA at Euler Circle since Winter 2018. Her other teaching experience includes TA-ing at Stanford Math Circle and grading undergraduate math classes. She has done research in several areas of mathematics, including graph theory, topological quantum field theories, and the mathematics of phylogenetics. When not doing math, Zoe studies English literature and enjoys learning new languages.