A long-time lieutenant to Steve Jobs and the executive who led the development of Mac OS X since its beginning is leaving Apple.

Bertrand Serlet, who developed Mac OS X, is to leave Apple. Photo credit: Apple
Bertrand Serlet said in a statement on Wednesday that, after 22 years, he wanted "to focus less on products and more on science". Craig Federighi, currently the vice president of Mac software engineering, will replace Serlet.
Serlet is an executive with roots that extend back to Xerox Parc as well as Next, the company Jobs led before selling it to Apple. He became senior vice president at Apple in 2003. The timing of Serlet's departure is bound to raise questions as the next version of the Mac operating system, Lion, is slated for release in the summer.
For more on this ZDNet UK-selected story, see Mac OS X father leaving Apple on CBS News.
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