Conversation so far:
What type of legacy did John Heisman leave behind?
Heisman was an innovator and "master strategist".
What type of innovation was he known for?
He developed one of the first shifts.
He was a proponent of the legalization of the forward pass.
What was the shift he developed called?
CANNOTANSWER.
Did he win any awards during his lifetime?
Heisman was inducted into the College Football Hall of Fame as a coach in 1954, a member of the second class of inductees.

Question: What year did he retire from coaching?
Self-contained rewrite: What year did John Heisman retire from coaching?