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Don Coryell's sphere of influence

Jim Hanifan, Don Coryell, Mike Martz and Joe Gibbs renewed acquaintances at a Redskins-Rams game in 2004. Hanifan and Gibbs coached under Coryell, and Martz has cited Coryell as a major influence. AP Photo/James A. Finley

ESPN celebrates the 100th anniversary of Vince Lombardi's birth with the "Greatest Coaches in NFL History" series, saluting the finest innovators, motivators, tacticians, teachers and champions ever to stalk the sidelines. Follow along as we reveal our list of the top 20 coaches of all time and document the lineage of the league's most influential coaching trees.

The Don Coryell branch of the Sid Gillman coaching tree is documented below with features on Coryell and his many disciples.

Special thanks to the Elias Sports Bureau for research assistance in compiling this project.