Conversation so far:
What did Art Spiegelman do for the New Yorker?
Art Spiegelman spent a decade as contributing artist for The New Yorker.
what else did he Art Spiegelman do at the new yorker besides contributing art?
Within The New Yorker's pages, Spiegelman contributed strips such as a collaboration titled In the Dumps with children's illustrator Maurice Sendak.

Question: who else did he work with?
Self-contained rewrite: who else did Art Spiegelman work with besides Maurice Sendak?