Robert Maynard Pirsig was an American writer and philosopher. He is the author of the philosophical books Zen and the Art of Motorcycle Maintenance: An Inquiry into Values (1974) and Lila: An Inquiry into Morals (1991), and he co-authored On Quality: An Inquiry Into Excellence: Selected and Unpublished Writings (2022) along with his wife and editor, Wendy Pirsig.