COMPANY: Siebel Systems
WHAT MAKES HIM HAUTE: The self-made tech billionaire got his start in the INDUSTRY: as a salesman for Larry Ellison’s Oracle. But when Ellison opted against Siebel’s sales-tracking software, Siebel launched his own company. Siebel Systems went public in 1996 and eventually was sold to Oracle in 2005 for the astounding price of $5.9 billion, securing Siebel a personal $500 million. Today, Siebel is chairman of holding company First Virtual Group, which has interests in real estate, agribusiness, philanthropy and asset management. Siebel is also the founder of the Siebel Foundation, which vehemently supports education, health, stem cell research, and methamphetamine prevention.