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Marc Lowell Andreessen is an American entrepreneur, investor, and software engineer. He is the co-author of Mosaic, the first widely used Web browser; co-founder of Netscape; and co-founder and general partner of Silicon Valley venture capital firm Andreessen Horowitz. He founded and later sold the software company Opsware to Hewlett-Packard. Andreessen is also a co-founder of Ning, a company that provides a platform for social networking websites. He sits on the board of directors of Facebook, eBay, and Hewlett Packard Enterprise, among others. A frequent keynote speaker and guest at Silicon Valley conferences, Andreessen was one of only six inductees in the World Wide Web Hall of Fame announced at the First International Conference on the World-Wide Web in 1994.

Marc Andreessen.jpg
Andreessen at the Tech Crunch40 conference in 2007
Born Marc Lowell Andreessen
(1971-07-09) July 9, 1971 (age 45)
Cedar Falls, Iowa, United States
Alma mater University of Illinois at Urbana–Champaign
Known for Developer of Mosaic
Founder of Netscape
Founder of Opsware
Founder of Andreessen Horowitz
Net worth Increase US$ 600 Million (est. 2015)
Spouse(s) Laura Arrillaga-Andreessen (m. 2006)
Children John (born in March 2015)

Marc Lowell Andreessen (/ænˈdrsən/ an-DREE-sən; born July 9, 1971) is an American entrepreneur, investor, and software engineer. He is the co-author of Mosaic, the first widely used Web browser; co-founder of Netscape; and co-founder and general partner of Silicon Valley venture capital firm Andreessen Horowitz. He founded and later sold the software company Opsware to Hewlett-Packard. Andreessen is also a co-founder of Ning, a company that provides a platform for social networking websites. He sits on the board of directors of Facebook, eBay, and Hewlett Packard Enterprise, among others. A frequent keynote speaker and guest at Silicon Valley conferences, Andreessen was one of only six inductees in the World Wide Web Hall of Fame announced at the First International Conference on the World-Wide Web in 1994.