Jack Dorsey

Jack Dorsey is a high-net-worth investor based in San Francisco, California. He has been running two tech heavyweights: Twitter and Square. At Twitter, co-founder Mr. Dorsey is back as CEO after the departure of Dick Costolo in June 2015. Dorsey is also heading payments company Square, which he co-founded in 2009; Square went public in November 2015 at a stock price well below its latest $6 billion private valuations. He manages his own investments.