Conversation so far:
What was Dixon like in adulthood?
A man of considerable stature, standing 6 and a half feet tall and weighing over 250 pounds.
What was his profession?
he took up boxing.
Was he good at boxing?
at which he was successful, winning the Illinois State Golden Gloves Heavyweight Championship (Novice Division) in 1937.

Question: What happened with his boxing career?
Self-contained rewrite: What happened with Dixon's boxing career?