No institution can possibly survive if it needs geniuses or supermen to manage it. It must be organized in such a way as to be able to get along under a leadership composed of average human beings.

Peter F. Drucker (1909–2005) Austrian-American business consultant

The Concept of the Corporation, Part 2, ch. 1 (1946)
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Drucker returned to this concept in a later book, The Effective Executive, ch. 1 (1966), where he wrote (about finding such things):

But we are not going to breed a new race of supermen. We will have to run our organizations with men as they are.