Thomas Siebel

$3.95 B

Ranked #1066 in World

About Thomas Siebel

Thomas M. Siebel, an American billionaire, born in Chicago, Illinois on November 20, 1952, is a renowned businessman and technologist with a net worth of $3.8 billion as of 2022. An alumnus of the University of Illinois at Urbana-Champaign, he excels as the CEO of C3.ai, known for pioneering enterprise AI solutions, and as the former CEO of CRM software leader Siebel Systems. Siebel is also a distinguished author and philanthropist, with notable contributions to education and technology sectors.

Born

November 22, 1952 in Chicago, Illinois, U.S.

Age

73 years

Source Of Wealth

Business Software

Industries

Technology

Citizenship

United States

Residence

Woodside, California

Education

Bachelor of Arts/Science, University of Illinois, Urbana-Champaign; Master of Business Administration, University of Illinois, Urbana-Champaign; Master of Science, University of Illinois, Urbana-Champaign

Spouse

Stacey Siebel

Children

Thomas M. Siebel was born on November 20, 1952, in Chicago, Illinois, U.S. He holds American nationality and has made significant contributions as a billionaire businessman, technologist, and author.

Thomas Siebel: Family

Thomas Siebel is married to Stacey Siebel, and together they have four children. He currently resides part-time in Montana, where he owns and operates a working cattle ranch.

Thomas Siebel: Career Highlights

Siebel's career journey includes several notable positions and achievements:

Executive at Oracle Corporation (1984-1990)
Chief Executive Officer of Gain Technology (1990-1992)
Founder, Chairman, and CEO of Siebel Systems (1993-2006)
Founder, Chairman, and CEO of C3.ai (2009-Present)
Chairman of First Virtual Group

Thomas Siebel: Companies

Siebel Systems

Siebel founded Siebel Systems in 1993, a software company focused on customer relationship management (CRM) applications. It was acquired by Oracle in January 2006.

C3.ai

C3.ai is a software company specializing in large-scale enterprise artificial intelligence. Founded by Thomas Siebel in 2009, it offers AI software products for various industries and was included in the "CNBC Disruptor 50" list in 2019.

Thomas Siebel: Major Achievements

Thomas Siebel's major achievements include:

Building Siebel Systems into a leading CRM software company
Founding C3.ai and driving its success in enterprise artificial intelligence
Authoring the book "Digital Transformation," which explores the impact of modern information technology on various sectors
Promoting a "self-learning corporate culture" and encouraging employee education and professional development

Thomas Siebel: Awards & Achievements

Siebel has received numerous honors and awards for his contributions:

Elected as a member of the American Academy of Arts and Sciences (2013)
Recipient of various awards for entrepreneurship, philanthropy, and technology leadership
Ranked among the world's top philanthropists by Barron's Magazine

Thomas Siebel: Personal Life & Legacy

Thomas Siebel is known for his philanthropic efforts through the Siebel Foundation, which supports causes such as homelessness, education, methamphetamine abuse prevention, and alternative energy solutions. He has also made significant donations to his alma mater, the University of Illinois at Urbana-Champaign, and launched the Siebel Energy Institute to research energy infrastructure data management.

Thomas Siebel: Trivia

An interesting fact about Thomas Siebel is that he currently holds the highest personal CO2 emissions from private jet use in the United States.

Additionally, he survived an elephant attack in Tanzania in 2009, undergoing multiple surgeries before making a full recovery.

Wealth History

Timeline

November 20, 1952

Thomas M. Siebel is born in Chicago, Illinois, U.S.

1974

Receives a B.A. in History from the University of Illinois at Urbana-Champaign.

1975

Earns an M.B.A. from the University of Illinois at Urbana-Champaign.

1978

Completes an M.S. in Computer Science from the University of Illinois at Urbana-Champaign.

1984-1990

Works as an executive at Oracle Corporation.

1990-1992

Serves as the Chief Executive Officer of Gain Technology.

1993

Founds Siebel Systems, a software company focused on customer relationship management (CRM) applications.

2006

Siebel Systems is acquired by Oracle.

2009

Founds C3.ai, a software company specializing in large-scale enterprise artificial intelligence.

2013

Elected as a member of the American Academy of Arts and Sciences.

2019

Publishes the book "Digital Transformation," discussing the impact of modern information technology on business, government, and society.

Thomas Siebel : FAQs

What is Thomas Siebel's current net worth?

Thomas Siebel's current net worth is $3.95 billion.

What is Thomas Siebel's current global rank among billionaires?

Thomas Siebel holds the 1066th position globally among billionaires.

What is Thomas Siebel's current ranking within the United States?

Thomas Siebel holds the 396th position in United States.

What was the change in Thomas Siebel's net worth compared to the previous year?

Thomas Siebel's net worth decreased by 100.58 million dollars compared to the previous year 2025, when his net worth was 4.05 billion dollars.

What is the recent change in Thomas Siebel's net worth?

Thomas Siebel's net worth decreased by 2.03 million dollars recently, a 0.05% decrease, with his net worth standing at 3.95 billion dollars.

What are Thomas Siebel's main sources of wealth?

Thomas Siebel's main source of income comes from Business Software.

In which industry does Thomas Siebel primarily operate?

Thomas Siebel is primarily involved in the Technology industry.

What is Thomas Siebel educational background?

Thomas Siebel holds a Bachelor of Arts/Science from the University of Illinois from Urbana-Champaign, a Master of Business Administration from the University of Illinois from Urbana-Champaign and a Master of Science from the University of Illinois from Urbana-Champaign.

How old is Thomas Siebel?

Thomas Siebel is 73 years old.

How many children does Thomas Siebel have?

Thomas Siebel has 4 children.

What is 'Digital Transformation' by Thomas Siebel about?

'Digital Transformation,' a book by Thomas Siebel published in 2019, explores the profound impact of information technology on business, government, and society, advocating for embracing digital transformation to succeed in the modern age.

How does Thomas M. Siebel approach corporate culture and employee development?

Thomas M. Siebel promotes a 'self-learning corporate culture' within his companies, providing cash awards and incentives to encourage employee education and professional development, fostering innovation and knowledge.

What philanthropic efforts has Thomas M. Siebel been recognized for?

The Siebel Foundation, founded by Thomas Siebel, supports causes such as homelessness, education, meth abuse prevention, and alternative energy. He is known for his donations to the University of Illinois and launching the Siebel Energy Institute, earning him spots among the top philanthropists by Barron's Magazine.