I was digging around on the Michigan alumni site and found this. The True Blue Podsquad sat down with Murray Greenberg, author of Passing Game: Benny Friedman and the Transformation of Football. The summary:
Passing was not a major part of football in the early part of the 20th century. Then in the 1920s, Benny Friedman, the son of Russian immigrants in Cleveland’s Jewish ghetto, arrived at Michigan with a style and ability that changed the game forever. AAUM staff member Brad Whitehouse interviews Murray Greenberg, the author of “Passing Game: Benny Friedman and the Transformation of Football,” to find out more about this largely forgotten U-M great.
And the audio:
You can pick up a copy of Passing Game here.