That's Dr Po-Shen Loh... Son of Singaporean immigrants to the USA. He is the National Coach of the winning USA International Mathematical Olympiad team since 2014 and won in 2015, 2016, 2018, and 2019—their first victories since 1994. Finally breaking the dominance of the Chinese.
He is the founder of Expii, a social enterprise that improves lives through education and healthcare, which began as an innovative learning platform where students have the power to choose how they learn.