Ken Griffin

About Ken Griffin

Ken Griffin founded and runs Citadel, a Miami-based hedge fund firm that manages $68 billion in assets.

Griffin founded Citadel in 1990 but first began trading from his Harvard dorm in 1987. He put a satellite dish on the roof to get real-time stock quotes.

Citadel is the world's most profitable hedge fund and has generated $83 billion in net gains since inception in 1990, according to LCH Investments.

Citadel Securities, one of Wall Street's biggest market-making firms, is responsible for one of every four stock trades in the U.S.

Griffin has given some $2.4 billion to philanthropic causes. Recent beneficiaries include Memorial Sloan Kettering Cancer Center and nonprofit hospitals in Miami.