University of Illinois grad became salesman for Oracle; left Larry Ellison's software giant 1990 after Ellison wouldn't take Siebel's sales-tracking software to market. Started rival Siebel Systems; public 1996. Sold to Oracle for $5.9 billion 2005; netted $500 million in cash. Now chairman of holding company First Virtual; owns interests in real estate, agribusiness, philanthropy and asset management. Siebel Foundation supports education, health, stem cell research, drug prevention.