Marc Andreessen is an American entrepreneur, investor, and software engineer. Andreessen is the co-author of Mosaic, the first widely used web browser; co-founder of Netscape Communications Corporation; and co-founder and general partner of Silicon Valley venture capital firm, Andreessen Horowitz.
Netscape was acquired by AOL in 1999 for $4.2 billion; Andreessen served as Chief Technology Officer at AOL until he left to form LoudCloud, a services-based Web hosting company. LoudCloud changed its name to Opsware in 2003 and was purchased by Hewlett-Packard in 2007 for $1.6 billion. Between 2005 and 2009, Marc Andreessen and business partner Ben Horowitz invested $4 million in 45 startups. In 2009, Andreessen and Horowitz founded Andreessen Horowitz.
Marc Andreessen is also co-founder of Ning, which was sold to Glam Media in 2011 for $150 million. As of June 2014, Andreessen sat on the boards of Facebook, eBay, Kno, Stanford Hospital, Bump Technologies, Oculus VR, TinyCo and Hewlett-Packard.