In any ranking of innovative NFL coaches who had a major impact on the game, Don Coryell must be a part of the conversation

The critics will say that Don Coryell never won a Super Bowl, and they'd be right. Yet Coryell, the only coach to win 100 games both at the NFL and college level, had an impact on the NFL game that is still seen decades after his coaching career ended. He opened up the passing game, created mismatches through shifts and breakthrough formations, was a pioneer of the I formation, brought the best out in his players and saw talent in young assistant coaches that he nurtured, sending them off to do great things. While Coryell never won a Super Bowl, he had more of an impact on modern football than many coaches who did. My story for ESPN.com's NFL section, as part of its series on great coaches. http://espn.go.com/nfl/story/_/page/coachingtreecoryell130524/greatest-nfl-coaches-don-coryell-branch-sid-gillman-coaching-tree?src=mobile