Conversation so far:
What is The New Yorker magazine?
The New Yorker is an American weekly magazine featuring journalism, commentary, criticism, essays, fiction, satire, cartoons, and poetry.
What happened in 1992 to Art Spiegelman?
Art Spiegelman was hired by Tina Brown as a contributing artist in 1992 for The New Yorker magazine.
Why did Art Spiegelman leave The New Yorker magazine?
Spiegelman asserted he left not over political differences, but because The New Yorker was not interested in doing serialized work, which he wanted to do with his next project.
What did Art Spiegelman work on while being employed by The New Yorker magazine?
Within The New Yorker's pages, Spiegelman contributed strips such as a collaboration titled In the Dumps with children's illustrator Maurice Sendak.
What was The New Yorker magazine's In the Dumps?
In the Dumps was a cartoon strip and article featuring meta versions of Art Spiegelman and Maurice Sendak.

Question: What other work did he do?
Self-contained rewrite: What other work did Art Spiegelman do for The New Yorker magazine besides In the Dumps?