Peter Brown

Worked as language technology expert at IBM. Joined Renaissance Technologies in 1993, promoted to co-chief executive after founder James Simons retired. Talkative and competitive, he's socially liberal and fiscally conservative, owns one home and drives a Prius. He wrote a computer program to seat people at his wedding. Has ridden a unicycle in the office. Is the son of Henry Brown, who invented the money-market fund.