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.

Question: What did he work on while being employed by the new yorker?
Self-contained rewrite: What did Art Spiegelman work on while being employed by The New Yorker magazine?