Apple Inc., long the model of stability in Silicon Valley, is suddenly undergoing its biggest personnel shake-up in decades, with senior executives and key engineers both hitting the exits.

In just the past week, Apple’s heads of artificial intelligence and interface design stepped down. Then the company announced that its general counsel and head of governmental affairs were leaving as well. All four executives have reported directly to Chief Executive Officer Tim Cook, marking an exceptional level of turnover in Apple’s C-suite.

And more changes are likely coming. Johny Srouji — senior vice president of hardware technologies and one of Apple’s most respected executives — recently told Cook that he is seriously considering leaving in the near future, according to people with knowledge o

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