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.
What did Stephen Hillenburg do with his free time?
Stephen Hillenburg's hobbies included surfing, snorkeling, scuba diving, swimming, and performing noisy rock music on his guitar.
Anything else that Stephen Hillenburg do with his free time?
Stepehen Hillenburg also enjoyed birdwatching at home, but said that he was always an ocean freak.
Did Stephen Hillenburg stick to himself mostly?
According to his colleagues, Stepehen Hillenburg was a perfectionist workaholic. He was also known for his private nature.
Any references to Spongebob in Stephen Hillenburg's personal life?
Stepehen Hillenburg, with his wife Karen Umland, endowed projects and organizations through the United Plankton Charitable Trust, which the couple established in 2005. Plankton is a character on Hillenburg's show.
What was Stephen Hillenburg diagnosed with?
Stephen Hillenburg disclosed in March 2017 that he had been diagnosed with amyotrophic lateral sclerosis (ALS), a fatal neurodegenerative disease.
Did Stephen Hillenburg recover from amyotrophic lateral sclerosis (ALS)?
Stephen Hillenburg died at his home on November 26, 2018, at the age of 57. The immediate cause of death was heart failure due to the ALS disease.

Question: Anything else?
Self-contained rewrite: Anything else about Stephen Hillenburg's illness, death, and legacy?