Co-author of Mosaic, the first widely used web browser with a graphical user interface. Co-founder of Netscape and general partner of Silicon Valley venture capital firm Andreessen Horowitz. Co-founder of Ning. Net-worth estimated at $1.7 billion by Forbes.

Bloomberg Opinion writer. Founder, TestAndTrace.com. He was an assistant professor of finance at Stony Brook University, and he blogs at Noahpinion.