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Marc Lowell Andreessen (/ænˈdriːsən/ AN-dree-sen; born July 9, 1971) is an American businessman and former software engineer. He is the co-author of Mosaic, the first widely used web browser with
a graphical user interface; co-founder of Netscape; and co-founder and general partner of Silicon Valley venture capital firm Andreessen Horowitz. He co-founded and later sold the software company Opsware to Hewlett-Packard; he also co-founded Ning, a company that provides a platform for social networking websites
