Apple Says Computer-Software Chief Serlet Is Stepping Down

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Apple Inc. announced the departure of Bertrand Serlet, a senior software engineer at the company since the return of Chief Executive Officer Steve Jobs in 1997 and a main architect of the Mac operating system.

Serlet, 50, senior vice president for computer-software engineering, is leaving to focus more on research, Cupertino, California-based Apple said today in a statement. Craig Federighi, the division’s vice president, will take Serlet’s place and report to Jobs.