Conversation so far:
What was Jim Steranko's early art career like?
During the day, Steranko made his living as an artist for a printing company in his hometown of Reading, designing and drawing pamphlets and flyers for local dance clubs.
what did he do next?
He moved on after five years to join an advertising agency, where he designed ads and drew products ranging from "baby carriages to beer cans".
did he stay there long?
CANNOTANSWER.

Question: What did he do next?
Self-contained rewrite: What did Jim Steranko do next?