Conversation so far:
Who did the recruit?
Omar.
Why?
recommendation.
By who?
Michal Urbaniak.
Who assited on this?
Zawinul and Shorter recruited.
How old was he?
23-year-old drummer.
What else did they like about him?
talented session player and multi-instrumentalist.
What else was he known for?
who had played with a variety of musicians.

Question: Who had he played for?
Self-contained rewrite: Who had Omar played for?