George Allen's sphere of influence

George Allen's Rams had an amazing .742 regular-season winning percentage from 1966-70. David Boss/USA TODAY Sports

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 George Allen branch of the George Halas coaching tree is documented in the chart below, followed by a feature on Allen and short biographies of his many disciples.

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