Marc Andreessen is an entrepreneur, investor and software engineer with a net worth of $700 million. Marc Andreessen has earned his net worth through his co-founding of Netscape, co-author of Mosiac and co-founder of Ning. He is an investor in several Plazes, Netvibes, Cast TV and Twitter, as well as serving on several boards, including Facebook, Ebay, Opsware and others. Marc Andreessen, along with partner Ben Horowitz formed a venture capital firm called Andreessen Horowitz that invests in the ideas of other entrepreneurs, as well as products and companies. They invested $46 million in the digital education platform company, "Kno." He was born in Cedar Falls, Iowa.