Conversation so far:
What did Patrick O'Brian publish as Patrick O'Brian?
non-fiction anthology A Book of Voyages (1947.
What other pen names did he use?
CANNOTANSWER.
Did he write anything besides prose fiction?
non-fiction anthology A Book of Voyages (1947) attracted little attention.
Was any of his work besides Master and Commander turned into a movie?
CANNOTANSWER.
Was he successful when he was alive?
greatest success in writing, gaining him fame, a following and invitations to events and interviews came late in his life.
Did he win any literary prizes?
last completed novel was published in October 1999, O'Brian wrote an article for a series of the best in the millennium ending, titled Full Nelson.

Question: What is he most famous for?
Self-contained rewrite: What is Patrick O'Brian most famous for?