Po-Shen Loh and his siblings

In this photo from 1999, Po-Shen Loh, 16, left, is pictured with siblings Po-Ling, 12, and Po-Ru, 14. At the time, the family of math whizzes was starting to rack up national awards. Po-Shen, now 33 and a math professor, just coached the U.S. Mathematical Olympiad Team to an international victory.