Phil Jackson- LA Lakers- has the best winning percentage but Don Nelson- Golden State Warriors- has the most wins. http://www.nba.com/history/records/victories_coaches.html
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I believe it is Robert Horry.
Robert Horry also has won the most NBA championships besides the 'Bill Russell' led celtics team.
Derik Fisher , LeBron James , Duncan, Horry. Lebron will probably be first after 2020