[1] He is the chairman of First Virtual Group, a diversified holding company with interests in investment management, commercial real estate, agribusiness, and philanthropy.

[3][4][5] Siebel is a graduate of the University of Illinois Urbana-Champaign, where he received a BA in history, an MBA, an MS in computer science,[6] and an honorary doctorate of engineering.

[8][9] Siebel served as chief executive officer of Gain Technology, a multimedia software company that merged with Sybase in December 1992.

[2] Siebel Systems was a software company primarily engaged in the design, development, marketing, and support of customer relationship management (CRM) applications.

As an executive at Oracle Corporation, Siebel proposed the idea of creating enterprise software applications tailored for marketing, sales, and customer service functions.

[13] Siebel Systems grew to over 8,000 employees in 32 countries, more than 4,500 corporate customers, and annual revenue greater than $2 billion before merging with Oracle in January 2006.

Employees who complete the MCS degree receive a salary increase of 15 percent, a cash bonus of $25‚000, and additional stock options.

[40] He was moved to Stanford Hospital where, over the next six months, they performed 11 surgeries, fixed his ribs and shoulder, and saved his left leg.

[39] In September 2010, a year after the attack, Siebel had undergone 16 surgeries and an Ilizarov apparatus external fixator to mend, lengthen, and reshape the tibia of his right leg.