Patrick Thomas O'Brien - wikipedia Patrick Thomas O'Brien Patrick Thomas O'Brien January 26, 1951 ( 1951 - 01 - 26 ) ( age 67 ) Wisconsin U.S. Occupation Actor Patrick Thomas O'Brien ( born January 26, 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. Life and career O'Brien was born in Wisconsin and graduated from Regis High School in Eau Claire. He then attended the University of Wisconsin - Eau Claire receiving his B.A. in 1975. O'Brien has appeared in several films including Stuart Little, The Curious Case of Benjamin Button, Catch Me If You Can and Kiss the Girls. Despite several movie appearances, the majority of O'Brien's career has centered on television. To name just a few T.V. shows, he has appeared on Monk, It 's Always Sunny in Philadelphia, Sabrina the Teenage Witch, The Gilmore Girls, The West Wing, Baywatch, Boston Common and Home Improvement. His most notable quote from Saved By The Bell was, `` Neil ! Do n't mess with the ' Dew - Man ' ! '' References ( 1 ) ( 2 ) ( 3 ) External links Patrick Thomas O'Brien on IMDb WorldCat Identities ISNI : 0000 0003 7423 8153 LCCN : n93044441 VIAF : 36125933 Retrieved from `` https://en.wikipedia.org/w/index.php?title=Patrick_Thomas_O%27Brien&oldid=848034120 '' Categories : American male television actors American male film actors Living people 1951 births University of Wisconsin -- Eau Claire alumni Hidden categories : Articles with hCards Wikipedia articles with ISNI identifiers Wikipedia articles with LCCN identifiers Wikipedia articles with VIAF identifiers Talk About Wikipedia Add links This page was last edited on 29 June 2018, at 11 : 06 ( UTC ). Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: who played mr dewey on saved by the bell
Answer: Patrick Thomas O'Brien