Tim Cook's advice to Apple's next CEO: The most important decision he'll make is 'where he spends his time'

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Apple’s incoming CEO introduced himself to Wall Street on Thursday, in a brief earnings-call debut in which John Ternus emphasized his commitment to continuity at the $4 trillion company.

Ternus, who will officially replace CEO Tim Cook in September, promised to continue the “deep thoughtfulness, deliberateness and discipline” in financial decision making that has marked Cook’s 15-year tenure leading Apple, calling his predecessor “one of the greatest business leaders of all time.”