Marc Andreessen

Marc Andreessen is an Americanentrepreneur, investor, and software engineer known for helping to shape the modern internet and the technology startup ecosystem. Marc's estimated net worth is around $1.9 billion as of 2025.

Andreessen co-founded Mosaic Communications, later renamed Netscape Communications, where he helped develop the Netscape Navigator browser. Netscape was sold to AOL in 1999 for $4.3 billion, and Andreessen became AOL’s Chief Technology Officer. That same year, he was named to the MIT Technology Review's TR100 list.

After Netscape, he co-founded Loudcloud, which was later renamed Opsware and sold to Hewlett-Packard for $1.6 billion in 2007.

Marc co-founded the venture capital firmAndreessen Horowitz(a16z) withBen Horowitz. The firm has invested in some of the world’s most successful technology companies including Facebook,Twitter, GitHub, Pinterest, Coinbase, and Skype. Marc also supported the development of special economic zones and modern cities focused on technology and innovation.

Marc has served on the boards of Meta (Facebook), eBay, Hewlett-Packard Enterprise, and others. He has advised tech leaders, including Mark Zuckerberg. He co-founded the social networking platform Ning and has written essays including the influential “Software is Eating the World”.

He was born on 9 July 1971 in Cedar Falls, Iowa, and was raised in Wisconsin. He earned a bachelor’s degree in computer science from the University of Illinois at Urbana-Champaign, where he co-created Mosaic, the first widely used web browser with a graphical interface. This innovation marked a major turning point in the development of the World Wide Web.