Cast & creator
Michael Cassidy
Best known for Law & Order: Special Victims Unit, The Rookie, Castle
Michael Cassidy (born March 20, 1983) is an American film and television actor. He is best known for his role as Zach Stevens on The O.C. and as Tyler Mitchell on the TBS comedy Men at Work. He portrayed Jonathan Walsh on comedy People of Earth from the show's start in 2016 until its 2018 cancellation.
19
film credits
26
television credits
44
1985–2026 · acting roles
6.5
average across scored titles
Signature credits
Known for
Across film & television
Filmography (45)
Showing 45 of 45 credits
Law & Order: Special Victims Unit
Derek Simpson
1999
The Rookie
Caleb Wright
2018
Castle
Greg McClintock
2009
Smallville
Grant Gabriel
2001
MacGyver
Robert Julian
1985
Scandal
Travis Harding
2012
The O.C.
Zach Stevens
2003
Station 19
Peter
2018
Good Trouble
Asher Bowen
2019
The Magicians
James
2015
Resident Alien
Dr. Ethan Stone
2021
Masters of Sex
Dr. Malcolm Toll
2013
Happy Endings
Male Lead
2011
Mythic Quest
Peter Cromwell
2020
Batman v Superman: Dawn of Justice
Jimmy Olsen
2016
Found
Christian Evans
2023
Ballard
Aaron
2025
Men at Work
Tyler
2012
Fatal Attraction
Clay Bishop
2023
Stalker
Brian Mitchell
2014
Army of the Dead
Sgt. Kelly
2021
The Guest Book
2017
Argo
Jordan's Analyst
2012
Gail Daughtry and the Celebrity Sex Pass
Tom Soursap McNoodleman
2026
The Guilt Trip
Fake Andy (uncredited)
2012
Privileged
Charlie Hogan
2008
Waco: The Aftermath
Bill Johnston
2023
Hidden Palms
Cliff Wiatt
2007
Are You There, Chelsea?
Jonathan
2012
Zoom
Dylan West / Houdini
2006
People of Earth
Jonathan Walsh
2016
Dog Days
Dr. Mike Stone
2018
Night of the Living Deb
Ryan Waverly
2015Night of the Living Deb
Producer
2015
Hypochondriac
NP Chaz
2022
Jingle Around the Clock
Max
2018
Boys On Film 3: American Boy
Johnny (segment "Dare")
2009
Delivered
Tom
2020Inside Room 334
Seth
2010
The Girl from Monday
Ted
2005
Breaking Fast
Kal
2020
The Dare Project
Johnny
2018
The Stray
Mitch Davis
2017
Dare
Johnny
2005