Five things to know about Tom Siebel

1. He raises cattle on his Montana ranch and is a competitive team roper.
2. A veteran of the business software industry, he left Oracle in 1990, started Siebel Systems in 1993, took the company public and later sold it to Oracle for $5.9 billion in 2005.
3. He"s authored or co-authored three books on e-commerce and the software industry.
4. With estimated wealth of $1.5 billion, he ranks 468th on Forbes" most recent list of the world"s billionaires.
5. He"s donated $242 million to education, social services, alternative energy and other causes, according to BusinessWeek, which listed him among the 50 most generous philanthropists in the country.