Conversation so far:
who does the voice of patrick on spongebob squarepants
Bill Fagerbakke voices Patrick from Spongebob Squarepants.
who created spongebob squarepants?
Stephen Hillenburg is the creator of Spongebob Squarepants.

Question: is the creator still alive?
Self-contained rewrite: is the creator of spongebob squarepants still alive?