Conversation so far:
When did American football coach Bill Edwards die?
American football coach Bill Edwards died June 12, 1987.
What did American football coach Bill Edwards die of?
Was American football coach Bill Edwards a coach as long as he lived?
Edwards retired in February 1973 after 39 years as a coach and administrator and said he would concentrate on hunting and fishing.
When did American football coach Bill Edwards start coaching?
Bill Edwards got his first coaching job in 1931.

Question: what was his greatest accomplishment?
Self-contained rewrite: What was American football coach Bill Edwards greatest accomplishment?