***Sign up for multiple classes and you will receive a 10% discount on all subsequent classes you take beyond the first one. You will also receive a 10% discount off your class registration fees for each additional student you refer to us; click on the "more info" link for more details.

About the Instructors

Tim Sanders - A former President of the American Regions Math League (ARML), Tim Sanders has coached ARML students in over a dozen states and has led both the SFBA/NorCal and Wild Wild West ARML teams to national championships in their respective divisions. Tim is the founder and President of mathleague.org and has promoted math competitions around the world, giving talks or organizing contests on six continents. In addition to having several years experience as a classroom teacher, Tim has taught a number of classes for Stanford's EPGY program and has taught AMC prep classes at all levels. Tim also developed the curriculum for an AoPS geometry class and has co-taught several classes for Art of Problem Solving.

Thinula De Silva - Thinula is currently finishing up his undergraduate degree at the University of Waterloo and hopes to pursue graduate studies in Combinatorics & Optimization. In high school, he served as the Head Problem Writer of the Mathematics Association of Toronto High Schools and continues to write problems for several math contests, including mathleague.org. He is currently the assembler for the Middle School contests and also teaches several of our classes and AfterMath sessions. Outside of mathleague.org, Thinula is on the Question Writing Committee for MATHCOUNTS and on the problem writing committee for ARML. He has also worked as a MATHCOUNTS National Reviewer in the past and was a teaching assistant for several classes run by Art of Problem Solving. In his spare time, Thinula enjoys playing Genshin Impact and many board games such as Chess, Go, and Othello.

Freya Edholm - Freya is an undergraduate at MIT ('23) double-majoring in Math w/Computer Science & Chemical-Biological Engineering. Her minors are in Statistics and Data Science & Chemistry. Freya qualified for the USNCO national exam 3 times, earning High Honors (top 50 nationally) in 2017. She was also an avid participant in math competitions, qualifying for the USAJMO, achieving a near-perfect AMC 12 score, and being boardmaster of a national championship ARML team. She co-authored the 2-volume series Proofs in Competition Math. As a TA for Art of Problem Solving and a coach for the SF Bay Area ARML teams, Freya has gained experience preparing students for math and chemistry competitions.

Michael Chen - Michael is currently studying Electrical and Biomedical Engineering at Vanderbilt University ('25). During high school, he frequently participated in many competitions, qualifying for AIME 5 times while earning awards at ARML, mathleague.org National competitions, and the US National Chemistry Olympiad. At mathleague.org, Michael works to run contests and the Relay Challenge with additional experience as a TA for the AMC 10/12 class and a coach for Wild Wild West ARML teams. In his spare time, Michael enjoys playing chess, watching sports, and exploring new places.

Classes may also be co-taught by other mathleague.org staff members if enrollment is large enough; we will try to keep the student/teacher ratio as low as possible while still providing excellent value for your money.