Bill Sharman
William Walton Bill Sharman was an American professional basketball player and coach. He is mostly known for his time with the Boston Celtics in the 1950s, partnering with Bob Cousy in what some consider the greatest backcourt duo of all time. As a coach, Sharman won titles in the ABL, ABA, and NBA, and is credited with introducing the morning shootaround.
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Source: Wikipedia