Thomas Siebel (born 1953). He was a top salesman for Orcale, but left in 1990. Founded Siebel Systems 1993, went public in 1996. Struggled through tech downturn, but regained footing in the rebound: Spent $70 million in 2003 to buy UpShot Corp. to run sales management software for client companies over the internet.
He is married and has 4 children. Education: University of Illinois at Urbana, Bachelor of Arts / Science, University of Illinois at Urbana, Master of Science.
$1.3 billion as of 2005.