Conversation so far:
Is Stephen Hillenburg married?
Stephen Hillenburg married Karen Umland in 1988.
What does Karen Umland do?
Karen Umland, was a Southern Californian chef who teaches at the New School of Cooking in Culver City, California.
Do Stepehen Hillenburg and Karen Umland have children?
In 1988, the couple's first and only child, son Clay Hillenburg, was born.

Question: What did he do with his free time?
Self-contained rewrite: What did Stephen Hillenburg do with his free time?