who is tom siebel
Billionaire Tom Siebel's Montana Ranch sold. Silicon Valley billionaire, Tom Siebel, founder of CRM vendor Siebel Systems, has sold his 62,000-acre Montana cattle ranch for $45 million. Siebel, software entrepreneur and a former Oracle executive, bought the N Bar Ranch, located 100 miles north of Billings on the edge of the Snowy Mountains and 35 miles southeast of Lewistown, ten years ago.