In professional football, 20 of the NFL's 32 head coaches trained under Bill Walsh of San Francisco 49ers or under someone in his coaching tree. . In hedge funds, dozens of protégés of Julian Robertson, the founder of the investment firm Tiger Management, have become top fund managers. And from 1994 until 2004, nine or the 11 executives who worked closely with Larry Eillison at Oracle and left the company without retiring went on to become CEOs, chairs, or COOs of other companies.

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