Gregg Popovich stepped down as coach of the San Antonio Spurs on Friday, ending a three-decade run that saw him lead the team to five NBA championships, become the league’s all-time wins leader and earn induction into the Basketball Hall of Fame.

If the answer is simply "a coach who wins the most," then the greatest coach in NBA history is Phil Jackson. The Zen Master has more seasons with a championship (11) than without one (nine).  Is the answer innovation,

Popovich has been with the Spurs for nearly 35 years. He was an assistant coach from 1988-92, then returned to the club on May 31, 1994, as its executive vice president for basketball operations and general manager. He fired coach Bob Hill and appointed himself coach on Dec. 10, 1996.