Tom Siebel is an American technology entrepreneur, author, and business leader. He is best known for founding Siebel Systems and C3 AI. His career covers enterprise software, customer relationship management, cloud computing, and artificial intelligence. Siebel founded Siebel Systems in 1993. Oracle later acquired the company in 2006. He then founded C3 AI in 2009, focusing on enterprise artificial intelligence. As of 2026, Siebel serves as C3 AI’s chairman and chief executive officer. His career offers a useful look at how business technology has evolved from CRM software to modern AI platforms.
Who is Thomas M. Siebel ? A brief biography
| Biography Detail | Information |
|---|---|
| Full Name | Thomas M. Siebel |
| Date of Birth | November 20, 1952 |
| Place of Birth | Chicago, Illinois, United States |
| Profession | Businessman, entrepreneur, technology executive, and philanthropist |
| Education | B.A. in History, M.B.A., and M.S. in Computer Science from the University of Illinois Urbana-Champaign |
| Known For | Founding Siebel Systems and C3 AI |
| Siebel Systems | Founded Siebel Systems in 1993, a company focused on customer relationship management (CRM) software |
| C3 AI | Founded C3 AI, an enterprise artificial intelligence software company |
| Business Career | Has worked extensively in enterprise software, cloud computing, artificial intelligence, and technology |
| Books | Author of Digital Transformation: Survive and Thrive in an Era of Mass Extinction |
| Philanthropy | Has supported initiatives involving education, conservation, public health, and community development |
| Public Recognition | Has received various business and technology honors for his contributions to the technology industry |
Who Is Tom Siebel?
Tom Siebel built his career around major changes in business technology. Before founding Siebel Systems, he worked at Oracle and served as CEO of Gain Technology. He founded Siebel Systems in 1993 and became its chairman and CEO. The company later grew into a major enterprise software business. Stanford reports that it had more than 8,000 employees and over 4,500 corporate customers before its merger with Oracle.
His education combines business, technology, and the humanities. Siebel studied at the University of Illinois at Urbana-Champaign. He earned a Bachelor of Arts in history, an MBA, and a Master of Science in computer science. He also received honorary engineering degrees. This combination of technical and business education became a useful foundation for his work in enterprise software.
Tom Siebel and Siebel Systems
Siebel Systems became closely associated with the growth of customer relationship management, or CRM, software. CRM tools help companies manage customer information, sales activities, marketing, and service operations. Siebel Systems focused on bringing these business processes into enterprise software. The company grew quickly and became an important name in the software industry. Its success established Siebel as a prominent technology entrepreneur.
The company’s growth reflected a major shift in business computing. Many organizations wanted software that could organize sales and customer information in one system. Siebel Systems addressed that demand with enterprise applications. By the late 1990s, the company had more than $2 billion in revenue and thousands of employees. Oracle completed its merger with Siebel Systems in January 2006.
Tom Siebel’s Move Into Artificial Intelligence
After the Oracle merger, Siebel moved toward another major technology trend. He founded C3 in 2009. The company later became C3 AI and focused on enterprise artificial intelligence. Its goal was to help large organizations use AI with their business data and operational systems. This represented a major shift from customer relationship software toward data-driven applications and artificial intelligence.
The move also continued a pattern in Siebel’s career. He has repeatedly focused on technologies that can change how companies operate. His earlier work centered on enterprise applications and CRM. His later work focuses on AI, data, cloud technology, and intelligent software. C3 AI now describes its platform as combining enterprise data, intelligent agents, and domain-specific AI models.
Tom Siebel and C3 AI
C3 AI develops software for organizations rather than primarily targeting individual consumers. Its platform supports enterprise data management, AI models, applications, and intelligent agents. The company serves industries that include energy, manufacturing, government, healthcare, and financial services. This enterprise focus connects closely with Siebel’s earlier experience building software for large organizations. For more: Peter Schiff: Economist, Investor and Gold Advocate
C3 AI has also expanded its focus on agentic AI. The company’s platform is designed to support AI agents that can perform tasks across business workflows. It also provides tools for data integration, model development, application deployment, and AI governance. These capabilities reflect the changing needs of companies adopting artificial intelligence. Instead of using AI only for analysis, businesses are exploring ways to connect it with everyday operations.
Tom Siebel’s Role at C3 AI in 2026
Tom Siebel’s role at C3 AI changed during 2025 and 2026. In September 2025, C3 AI appointed Stephen Ehikian as CEO. Siebel then continued as executive chairman. The leadership structure changed again in May 2026. C3 AI announced that Siebel had resumed the CEO position effective May 8, 2026. He also continued as chairman of the board.
C3 AI’s June 2026 results provided more detail about the company’s position. The company reported fiscal 2026 revenue of $250.3 million. Subscription revenue reached $227.1 million for the year. C3 AI also reported a fiscal-year GAAP operating loss of $498.5 million. These figures provide important context when examining Siebel’s return to the CEO role and the company’s current business strategy.
Tom Siebel’s Books
Tom Siebel has written several books about technology and business. His published works include Virtual Selling, Cyber Rules, Taking Care of eBusiness, and Digital Transformation: Survive and Thrive in an Era of Mass Extinction. His books explore subjects such as enterprise software, digital business, technology strategy, and organizational change.
His 2019 book Digital Transformation examines how technologies such as artificial intelligence, cloud computing, big data, and the Internet of Things can change businesses. The book reflects ideas that also appear throughout his career. For readers interested in digital strategy, it provides additional context about his approach to technology. It can also serve as useful background before exploring his work at C3 AI.
Tom Siebel’s Leadership and Philanthropy
Tom Siebel has also been involved in education, research, and philanthropy. The Thomas and Stacey Siebel Foundation supports projects connected with energy, education, research, public health, and assistance for disadvantaged communities. His philanthropic activities therefore extend beyond his technology companies. They also include support for academic and scientific initiatives.
Siebel maintains connections with several academic institutions. C3 AI states that he serves on College of Engineering boards at the University of Illinois and the University of California, Berkeley. He is also a director of the Hoover Institution and a member of the American Academy of Arts and Sciences. These roles reflect his continuing involvement in technology, education, and research.
Why Is Tom Siebel Important in Enterprise Technology?
Tom Siebel’s career connects two important eras of business software. His first major company helped develop the CRM software market during the rise of enterprise applications. His later company focuses on artificial intelligence for large organizations. Both businesses address a similar question: how can software help companies manage complex operations more effectively?
His career also shows how enterprise technology continues to evolve. CRM software helped companies organize customer relationships and sales information. Modern AI can analyze large datasets, support decisions, and automate business workflows. C3 AI’s current platform reflects this shift toward intelligent enterprise applications. For anyone researching the history of business technology, Siebel’s career provides a useful case study.
Frequently Asked Questions
Who is Tom Siebel?
Tom Siebel is a technology entrepreneur and author. He founded Siebel Systems and C3 AI and is known for his work in enterprise software and artificial intelligence.
What is Tom Siebel known for?
He is best known for founding Siebel Systems, a major CRM software company, and C3 AI, an enterprise artificial intelligence company.
Is Tom Siebel the CEO of C3 AI?
Yes. As of 2026, Tom Siebel serves as chairman and CEO of C3 AI. He resumed the CEO role in May 2026.
What did Tom Siebel study?
He studied at the University of Illinois at Urbana-Champaign. His degrees include history, business administration, and computer science.
What companies did Tom Siebel found?
He founded Siebel Systems in 1993 and C3 AI in 2009. Siebel Systems later merged with Oracle in 2006.
Conclusion
Tom Siebel has spent decades building companies around major developments in business technology. Siebel Systems became a major force in CRM software before its merger with Oracle. He later founded C3 AI and shifted his focus toward enterprise artificial intelligence. In 2026, he returned to the CEO role at C3 AI while continuing as chairman.
His career provides a useful perspective on the evolution of enterprise software. Readers interested in technology leadership can explore his books and C3 AI’s work for more context. Understanding his journey also helps explain the broader transition from traditional enterprise applications to AI-powered business systems.
