He has worked his entire life at Apple, with the exception of a brief hiatus during which he studied at the University of California, Berkeley,[3] where his freshman advisor was graduate student Andy Hertzfeld, who along with Barney Stone had started a local Apple user group.

[2] In 1981, Jobs convinced Espinosa to drop out of Berkeley to work in Apple's publications department.

[3] He has contributed to the classic Mac OS, A/UX, HyperCard, Taligent and Kaleida Labs (as project manager in the AIM alliance),[5][6] AppleScript, Xcode, macOS, and the iOS Family Sharing system.

[7] He is a frequent speaker at Apple's Worldwide Developers Conference and occasionally appears as a panelist at its Stump the Experts session.

[citation needed] Actor Eddie Hassell portrayed Espinosa in the 2013 film Jobs.