The 411 on Netscape's Marc Andreessen

(Corrects spelling of Marc Andreessen's name in headline)

In the 15 years since Netscape's initial public offering made him rich, Marc Andreessen, 39, has become a ubiquitous Silicon Valley power broker. He's an entrepreneur, he's an investor, he's hunting CEO candidates for Hewlett-Packard (HPQ). It's hard to keep track.

Entrepreneur

Netscape, née Mosaic Communications, was only his first act. After AOL (TWX) bought the browser firm in 1998 and then merged with Time Warner, Andreessen departed and has formed a range of companies.

Netscape: Web-browser startup; went public in 1995

Opsware: Network software; bought by HP

Ning: Social network

Andreessen Horowitz: Venture capital firm. (Bloomberg LP is an investor)

Venture Capitalist

Andreessen Horowitz, the $300 million investment fund he launched a year ago, has already backed a string of apparent winners. The firm is reportedly raising a second, larger fund.

Skype: Internet calling

Zynga: Social gaming

Boku: Mobile payments

Asana: Business collaboration software

Foursquare: "Check-in" smartphone applications

SnapLogic: Cloud computing

GoodData: Business analytic tools

Angel Investor

Years before he created his VC firm, Andreessen (who wouldn't comment for this article) was investing in, and mentoring, dozens of startups in all corners of computing.

Twitter: Micro-blogging

LinkedIn: Social network

Digg: Social news site

Business Insider: Blog network

Tiny Speck: Online games

Scribd: Document publishing site

Blekko: Search engine

Crowd Fusion: Online publishing

Board Member

Andreessen is on some of the highest-profile boards in Silicon Valley. That includes the board of HP, which this summer voted to oust its chief executive, Mark Hurd, after an investigation into allegations of sexual harassment.

HP: On executive search committee

Skype: Spun off by eBay with IPO plans

eBay: Helping CEO John Donahoe with a turnaround

Facebook: One of the social network's five directors

Kno: Startup that makes digital textbook readers