Best known as the inventor of the Web browser, Andreessen has been one of the most formidable figures of the Internet for the last two decades. He developed the first browser, Mosaic, for the National Center for Supercomputing Applications. He then co-founded what would become Netscape Communications, which produced Netscape Navigator—the world's most popular browser until Microsoft's Internet Explorer surpassed it (see: U.S. v. Microsoft).
Andreessen also spearheaded the software-as-a-service model by co-founding Loudcloud, which later became Opsware. He also co-created Ning, an online platform that allows individuals and organizations to create custom social networks. In 2009, Andreessen teamed up with his longtime business partner Ben Horowitz to form the venture capital firm Andreessen Horowitz. Along with Facebook, Andreessen has invested in Twitter, Pinterest, Instagram and Digg.
In April, Time magazine named Andreessen one of its 100 most influential people in the world.
Born: July 9, 1971, Cedar Falls, IA
Lives: Menlo Park, CA
Education: University of Illinois, B.A.
Relationship to Facebook
A Facebook board member since 2008, Andreessen owns 6.6 million Class B shares, in addition to 5.2 million restricted shares. As an investor in Instagram, Andreessen will pick up more Facebook shares after the company closes its acquisition of the photo-sharing app.
Current Occupation: Co-founder and general partner, Andreessen Horowitz; Co-founder and chairman, Ning
Former Occupation: Netscape Communications, America Online, Loudcloud/Opsware