Thomas M. Siebel

Overview

An established angel investor and founder with a focus on enterprise software and artificial intelligence. Thomas M. Siebel is an American businessman, technologist, and author, best known for founding Siebel Systems, a leading customer relationship management (CRM) software company, which was acquired by Oracle Corporation in 2006. He is currently the founder, chairman, and executive chairman of C3.ai, an enterprise artificial intelligence software company. In 2025, Siebel initiated a search for a new CEO for C3.ai due to health concerns, after being diagnosed with an autoimmune disease that caused significant visual impairment. Siebel's investment strategy centers on early-stage and growth-stage companies within the technology sector, particularly those specializing in artificial intelligence and software development. His portfolio includes C3.ai, where he serves as executive chairman, and he has been involved in various philanthropic endeavors, including the Siebel Scholars Foundation and the Montana Meth Project. His approach emphasizes innovation, strategic partnerships, and the transformative potential of AI technologies in enterprise applications. Siebel's leadership at C3.ai has been marked by a commitment to advancing AI solutions for businesses, aiming to drive digital transformation across industries. His focus on integrating AI into enterprise software reflects his belief in the significant impact of technology on business operations and decision-making processes. Despite health challenges, Siebel remains actively engaged in the strategic direction and growth of C3.ai, underscoring his dedication to the company's mission and the broader AI industry.