Conversation so far:
What was Orson Welles' first project in radio?
In addition to being a repertory player on The March of Time, in the fall of 1936 Orson Welles adapted and performed Hamlet on CBS Radio's Columbia Workshop.
How much did Orson Welles make while doing radio?
Between 1935 and 1937 Orson Welles was earning as much as $2,000 a week, shuttling between radio studios at such a pace that he would arrive barely in time.

Question: Which studios did he perform for?
Self-contained rewrite: Which studios did Orson Welles perform for?