Judy Estrin's career ranges from founder of Bridge Communications to CTO of Cisco to running Packet Design LLC. Quite the girl geek, eh?

Most nerds know Bob Kahn co-wrote TCP/IP; earlier he worked at Bolt Beranek & Newman where he was the primary architect for the Arpanet.

Doug Engelbart invented computer networks, time sharing, graphical user interfaces, and the mouse--all while driving to work one day in 1951. Really.

Dan Bricklin invented the spreadsheet -- personal computing's first killer app -- built and lost the first PC software empire and somehow remains a nice guy filled with ideas.

Anina represents the new European tradition in mobile Internet development. And you'd never guess her day job.

Avram Miller went from playing jazz piano to building DEC's first PC to starting Intel's venture fund.

Dan Drake and a roomful of friends put together $59,030 and started Autodesk with a bunch of bad ideas and one that panned-out -- AutoCAD. Sometimes one is enough.

Dave Winer has been in the software industry since the days he worked with Mitch Kapor BEFORE Lotus 1-2-3.

Open Source pioneer Tim O'Reilly noticed the free software didn't come with free printed manuals and so a publishing empire was born.

Although Brewster Kahle started and sold companies for big bucks, his true love is capturing the whole Internet at the Internet Archive, which he founded and runs today.

Bill Joy -- the father of Berkeley UNIX -- explains why he was fired from the International House of Pancakes.

Max Levchin, best known for co-founding PayPal, explains why he is starting his 5th through 7th companies and the virtues of staying up all night.

Andy Hertzfeld, the original Macintosh systems programmer, talks about Mac History and how he fell in love with Open Source software.