Billionaire Profile
James Clark
Global Rank
#455

Image: Public domain | via Wikimedia Commons

James Clark

CEO, Netscape
US
Real-Time Net Worth
$7.9B
As of December 2025
Age
81
Source
Netscape, investments
Industry
technology
Citizenship
US

Biography

James H. Clark, born in 1944, is a highly successful American entrepreneur and computer scientist, recognized for his significant contributions to the technology sector. With an estimated net worth of $7.9 billion, Clark's wealth stems primarily from his ventures in Netscape and strategic investments. His career is marked by founding several groundbreaking companies, including Silicon Graphics (SGI), Netscape, Healtheon (later WebMD), and myCFO. He is renowned for his instrumental role in popularizing the internet through the creation of the Netscape Navigator web browser.

Wealth Over Time

In-Depth Profile

Early Life and Education

James Henry Clark was born on March 23, 1944, in Plainview, Texas. His early life was marked by challenges, including a family divorce and his own disciplinary issues, leading him to drop out of high school at age 16. He served in the US Navy for four years, where he developed an interest in electronics. After his military service, Clark pursued higher education, earning bachelor's and master's degrees in physics from the University of New Orleans. He later obtained a Ph.D. in computer science from the University of Utah in 1974.

Rise to Success

Clark's career began in academia, holding positions at UC Santa Cruz and Stanford University. He transitioned to Silicon Valley, co-founding Silicon Graphics (SGI) in 1982, which revolutionized visual effects in movies. In 1994, Clark co-founded Netscape with Marc Andreessen, creating the Netscape Navigator web browser. Netscape's initial public offering (IPO) in 1995 was a landmark event, fueling the dot-com boom. Clark's foresight led to early investments in Apple, Facebook, Twitter, and Palantir, further multiplying his wealth.

Key Business Strategies

Clark's strategies included recognizing and capitalizing on emerging technologies, as demonstrated by his founding of SGI and Netscape. He focused on creating user-friendly interfaces and applications, notably with Netscape Navigator, and assembling talented teams. Furthermore, his investment decisions in companies like Apple and Palantir proved highly successful, reflecting a knack for identifying future tech leaders.

Philanthropy

Throughout his career, Clark has engaged in philanthropy, contributing to education and environmental causes. He has donated to educational institutions such as Stanford University, where he established the James H. Clark Center for Biomedical Engineering, and Tulane University. He also supported the documentary film "The Cove," which highlighted issues related to Japanese dolphin hunting.

Career Milestones

1982

Co-founded Silicon Graphics (SGI)

Co-founded Silicon Graphics (SGI), a pioneer in high-end graphics workstations and visual effects technology.

1994

Co-founded Netscape

Co-founded Netscape, launching the Netscape Navigator web browser.

1998

Netscape acquired by AOL

Netscape was purchased by America Online (AOL).

1999

Founded Healtheon

Founded Healtheon, a healthcare technology company that merged with WebMD.

Philanthropy & Social Impact

Education

Stanford University

$150M

Donated to establish the James H. Clark Center for Biomedical Engineering and Science

Education

Tulane University

$30M

Donated to Tulane University's School of Engineering for scholarships

Environmental Conservation

The Cove

Undisclosed

Financial backer of the documentary film "The Cove"