Conversation so far:
When did Rocky Graziano begin his professional career?
As he grew older and seeing no other way to raise his standard of living, Rocky Graziano signed a few boxing contracts.
Did Rocky Graziano have a professional boxing career?
Rocky Graziano signed a few boxing contracts, but the rigors of training disinterested him.
How many championships did Rocky Graziano win?
At age 18 Rocky Graziano won the Metropolitan A.A.U. welterweight championship. In 1947 he became world middleweight champion.

Question: Did he have a trainer?
Self-contained rewrite: Did Rocky Graziano have a trainer?