Stan Bowman was the general manager of record when the Chicago Blackhawks won three Stanley Cups last decade. Those championships were won with a core of players that were acquired by his predecessor, Dale Tallon.
Tallon's moves took the team from being completely irrelevant to being on the cusp of a dynastic run when he was unceremoniously stripped of his power in 2009.
Tallon acquired an impressive group of talent
The only significant mistake he ever made was his inability to handle paperwork effectively. He missed a deadline for sending qualifying offers to some restricted free agents.