Dr. Guy (Bud) Tribble
Vice President, Software Tech

Tribble and Apple go way back. A college undergrad, he led development of the operating system for the first Macintosh in the early 1980s. Eventually, he followed Jobs to NeXT where he ran software development, served time as Sun Microsystems' chief technology officer, and earned a medical degree. Apple credits Tribble's ongoing role with helping define the software engineering group's technical direction, but insiders also single him out as the company's unofficial CTO.

Last updated August 24 2011: 8:00 PM ET