Who We Are



Mark Sellke

Mark Sellke is currently a PhD student at Stanford University in mathematics. Previously he was a student at MIT and the University of Cambridge. He has won MathCounts and the Putnam, and earned gold medals for the USA at the 2013 and 2014 IMOs. Mark’s research is in probability and theoretical computer science/machine learning. Mark has enjoyed giving back to the math contest community by teaching/grading at MOP and writing several TST(ST) problems.

Yang Liu

Yang Liu is currently a PhD student in mathematics at Stanford University, having previously graduated from MIT. He has placed second in MathCounts and earned gold medals for the USA at the 2014 and 2015 IMOs. He also was a USA Computing Olympiad Finalist in 2014 and 2015. He has done research in number theory and theoretical computer science. Yang has stayed involved with the math contest community and was the USA IMO Deputy Leader in 2019. Yang also enjoys playing basketball and other sports.

Ofer Grossman

Ofer Grossman is a PhD student at MIT for theoretical computer science. He has been a member of the Israeli IMO team, and placed in the top 15 in the Putnam Competition. Ofer is an instructor for the SPARC summer camp, and has instructed at the Israeli IMO team training camp.