Conversation so far:
What did Stephen Hillenburg start his career in?
Stephen Hillenburg held various jobs in 1984, including as a park service attendant in Utah and an art director in San Francisco, before landing the job he wanted: teaching children.
What subject did Stephen Hillenburg teach when he became a teacher?
Stephen Hillenburg was a marine-biology teacher at the Orange County Marine Institute (now known as the Ocean Institute) for three years.

Question: Did he teach any other subjects alone the years?
Self-contained rewrite: Did Stephen Hillenburg teach any other subjucts besides marine-biology along the years?