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.
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?
Casey Kasem moved to California. At KYA in San Francisco, the general manager suggested that he tone down his delivery and talk about the records instead.
Did Casey Kasem follow the advice of the general manager at KYA in San Francisco?
At KEWB in Oakland, California, Casey Kasem became both the music director and an on-air personality.
What did Casey Kasem do instead toning down his delivery and just taking about the records?
Casey Kasem became an on-air personality. He created a show that mixed in biographical tidbits about the artists and songs he played, attracting the attention of Bill Gavin.
Did Casey Kasem and Bill Gavin end up becoming partners?
After Casey Kasem joined KRLA in Los Angeles in 1963, his career began to blossom.

Question: what did he do as it blossomed?
Self-contained rewrite: What did Casey Kasem do as is career began to blossom?