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Tim Cook and Warren Buffett are showing what former CEOs can do for their companies

Buffett has long been a fan of Apple and Cook's leadership. VALERIE MACON/AFP via Getty Images; Daniel Zuchnik/WireImage Tim Cook and Warren Buffett are showing that former CEOs can remain central players at companies. Cook is poised to help new CEO John Ternus by leveraging his global connections as executive chair. Buffett led Berkshire's huge investment in Alphabet and consults with his successor on major…