Patrick Thomas O'Brien

This biography of a living person needs additional citations for verification. Please help by adding reliable sources. Contentious material about living persons that is unsourced or poorly sourced must be removed immediately from the article and its talk page, especially if potentially libelous. Find sources: "Patrick Thomas O'Brien" – news · newspapers · books · scholar · JSTOR (June 2021) (Learn how and when to remove this message)

Patrick Thomas O'Brien (born 1951) is an American actor. He is perhaps best known for playing the role of Mr. Dewey, the math teacher from Saved by the Bell.^[1]