It’s well known that Peter Drucker was critical of Steve Job’s management talents when Steve left Apple in 1985:
“If you look at the successful companies,” Drucker added, “they are the ones who either learn management or they bring it in. In the really successful high-tech companies, usually the originator isn’t there five years later. He may be on the board; he may be honorary chairman. But he is out, and usually with bitterness. … Jobs lacked the discipline. I don’t mean the self-discipline. I mean the basic knowledges and the willingness to apply them.”
Most management gurus agree that Drucker would have provided a much different analysis 25 years later. This blog post provides some insight on that front.