Marc Andreessen

From Mosaic and Netscape to venture capital

While studying computer science at the University of Illinois and working at the National Center for Supercomputing Applications, Andreessen collaborated with Eric Bina on Mosaic, one of the first widely used graphical web browsers. After graduation he moved to California and co-founded Netscape Communications. ^[1]

Netscape became one of the defining early commercial internet companies and was acquired by AOL in 1999. Andreessen later helped build other software businesses before co-founding Andreessen Horowitz with Ben Horowitz in 2009, turning his operating experience into a large venture-investment platform. ^[1][2]

The reviewed evidence ties Andreessen's wealth to founder equity, software company creation and venture investing rather than inherited business ownership. His career benefited from access to a strong university computing environment, but the billionaire-scale outcome was primarily produced by companies and investments he helped create. ^[1][2]

A16z's assets under management and the enterprise values of its portfolio companies are not Andreessen's personal wealth. His economics come from the ownership and partnership interests attributable to him, making fund scale and portfolio-company valuations different measures from the value that ultimately accrues to the individual investor. ^[2][1]