Patrick Thomas O'Brien
Acting
Born: 1951-01-26
Wisconsin, USA
Known For
66 Works
7.6
CSI: Crime Scene Investigation
2000
tv
7.9
Monk
2002
tv
7.8
ER
1994
tv
8.5
Malcolm in the Middle
2000
tv
7.9
Gilmore Girls
2000
tv
7.7
Married... with Children
1987
tv
8.3
The West Wing
1999
tv
8.3
It's Always Sunny in Philadelphia
2005
tv
6.0
Baywatch
1989
tv
8.0
Babylon 5
1994
tv
7.4
Home Improvement
1991
tv
7.8
Sabrina, the Teenage Witch
1996
tv