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Chuck Noll's sphere of influence

Chuck Noll began coaching under Sid Gillman en route to unprecedented success in Pittsburgh. Focus on Sport/Getty Images

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 Chuck Noll branch of the Sid Gillman coaching tree is documented below with features on Noll and his many disciples.

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