Conversation so far:
Is Stephen Hillenburg married?
Hillenburg's wife, Karen.
What does she do?
a chef who teaches at the New School of Cooking in Culver City, California.
Do they have children?
He would jam with his son who is a drummer.
What did he do with his free time?
He also enjoys birdwatching at home.
anything else?
known for his private nature.

Question: Did he stick to himself mostly?
Self-contained rewrite: Did Stephen Hillenburg stick to himself mostly?