Known For
Acting
Known Credits
66
Gender
Male
Birthday
1951-01-26 (74 years old)
Place of Birth
Wisconsin, USA
We don't have a biography for Patrick Thomas O'Brien.
CSI: Crime Scene Investigation
Monk
Malcolm in the Middle
Gilmore Girls
It's Always Sunny in Philadelphia
Married... with Children
The West Wing
ER
Baywatch
Catch Me If You Can
Babylon 5
Drake & Josh
Sabrina, the Teenage Witch
Home Improvement
Night Court
Family Matters
The Wonder Years
The Facts of Life
Lois & Clark: The New Adventures of Superman
Sliders
Step by Step
Felicity
Reba
Jake and the Fatman
Roswell
7th Heaven
Caroline in the City
Dharma & Greg
The Curious Case of Benjamin Button
The Naked Truth
Parker Lewis Can't Lose
Saved by the Bell
Carnivàle
Saved by the Bell: The New Class
Cybill
Stuart Little
The John Larroquette Show
Dickie Roberts: Former Child Star
Pleasantville
Son of the Beach
Kiss the Girls
Working
Airborne
Wagons East!
Inhabited
Forget Paris
Rescuing Christmas
Boston Common
Intolerable Cruelty
The Brady Bunch Movie
Sold Out
The Autopsy of Albert Kemper
Camp Cucamonga
Eight Days a Week
Unholy Communion
Union Square
Marilyn and Me
State of Grace
Win a Date with Tad Hamilton!
Dead Man on Campus
UHF
The Personals
Uncross the Stars
Co-Incidence