Conversation so far:
What did Casey Kasem do in his early career?
Casey Kasem began his professional broadcasting career in Flint, Michigan. He became a disc jockey for WJBK-AM in Detroit, WBNY in Buffalo, NY, and a station in Cleveland.

Question: what did he do next?
Self-contained rewrite: What did Casey Kasum do after working as a disc jockey for WJBK-AM in Detroit, WBNY in Buffalo, NY, and a station in Cleveland?