**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 has won the national championship for the last three 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 three 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.

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**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 geometry and about using algebraic and probabilistic methods in combinatorial problems. Some current areas she is learning more about include geometric measure theory, local class field theory, and representation theory. She has written three papers on number 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. She also has been an assistant instructor and grader for the Art of Problem Solving, has tutored many advanced middle and high school math students in the Bay Area, and is a teaching assistant for the Stanford information theory group in the EECS department.

**Zoe Himwich** is a math major in her junior 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 combinatorics, topological quantum field theories, and the mathematics of phylogenetics. When not doing math, Zoe studies English literature and enjoys learning new languages.