Conversation so far:
When did Wilson begin producing records?
Brian attempted to establish himself as a record producer by working with various artists.
On July 20, 1963.
What artists did he work with?
Brian's other non-Beach Boy work in this period included tracks by the Castells, Donna Loren, Sharon Marie, the Timers, and the Survivors.

Question: Did he work with anyone else?
Self-contained rewrite: Other than the Castells, Donna Loren, Sharon Marie, the Timers, and the Survivors, Did Brian Wilson work with anyone else?