Marc Lowell Andreessen is an American entrepreneur, investor, and software engineer. He is the co-author of Mosaic, the first widely-used Web browser; co-founder of Netscape and co-founder and General Partner of Silicon Valley venture capital firm Andreessen Horowitz. Also, he has an estimated net worth of $600 Mn. He sits on the Board of Directors of Facebook, Hewlett-Packard Enterprise, and eBay.