Marc Andreessen: Co-founder of Andreessen Horowitz and Netscape
Business Owner · Financial Services
Marc Andreessen co-authored Mosaic, the first web browser to show inline images, co-founded Netscape and later the venture capital firm Andreessen Horowitz.
About Marc Andreessen: Co-founder of Andreessen Horowitz and Netscape
Marc Lowell Andreessen (born July 9, 1971, in Cedar Falls, Iowa) is an American businessman, venture capitalist and former software engineer. He is the co-author of Mosaic, the first web browser to display inline images, co-founder of Netscape, and co-founder and general partner of the Silicon Valley venture capital firm Andreessen Horowitz. He also co-founded and later sold the software company Opsware to Hewlett-Packard, and co-founded Ning, a platform for social networking sites. In 2024 he became an adviser to Donald Trump, and as of June 2026 Forbes estimated his net worth at $1.9 billion. Andreessen was raised in New Lisbon, Wisconsin, which he considered "the sticks", the son of Patricia, a customer service operator at Lands' End, and Lowell Andreessen, a sales manager for the seed producer Pioneer Hi-Bred International, and he has a younger brother, Jeff. He has said he had problematic relationships with his parents and brother and does not like to talk about them. He discovered programming at 12 and in December 1993 received his bachelor's degree in computer science from the University of Illinois at Urbana-Champaign, having interned twice at IBM in Austin, Texas. Sources: English Wikipedia (Marc Andreessen, accessed September 2026).
Basic Information
Co-founder and general partner, Andreessen Horowitz; co-founder, Netscape
Company Details
Andreessen Horowitz (a16z)
Venture Capital, Web Software
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