Conversation so far:
What did J. Paul Getty do in his later years?
J. Paul Getty remained an inveterate hard worker, boasting at age 74 that he often worked 16 to 18 hours per day overseeing his operations across the world
Was J. Paul Getty a wealthy man?
At J. Paul Getty's death, he was worth more than $6 billion
Was J. Paul Getty married?
J. Paul Getty was married and divorced five times. He had five sons with four of his wives

Question: what was his greatest accomplishment?
Self-contained rewrite: What was J. Paul Getty's greatest accomplishment?