Conversation so far:
What did Donnie Yen do with martial arts?
Donnie Yen Ji-dan is a Hong Kong actor, martial artist, film director, producer, action choreographer, stuntman and multiple-time world wushu tournament champion.
When did Donnie Yen start learning martial arts?
At a young age, under the influence of his mother, Donnie Yen developed an interest in martial arts and began experimenting. Yen then started kung fu when he was nine

Question: Did anyone else teach him?
Self-contained rewrite: Did anyone else teach Donnie Yen?