Robert Sean Leonard (born February 28, 1969) is an award-winning American actor.
He has regularly starred in Broadway and off-Broadway productions, but is most known for his roles on House and in Dead Poets Society.
Law & Order: Special Victims Unit
1999 - • Kenneth O'Dwyer
The Good Doctor
2017 - 2024 • Shamus O'Malley
The Gilded Age
2022 - • Matthew Forte
The Blacklist
2013 - 2023 • Frederick Barnes
The Hot Zone
2019 - 2021 • Walter Humbolt
The Good Wife
2009 - 2016 • Del Paul
Battle Creek
2015 - 2015 • Brock
House: Swan Song
2012 • Self
House
2004 - 2012 • James Wilson
Nantucket
2011 • Narrator
Hallmark Hall of Fame
1951 - 1978 • Jesse Chandler
The I Inside
2004 • Peter
A Painted House
2003 • Jesse Chandler
The Outer Limits
1995 - 2002 • Robby Archer
Tape
2001 • Jon Salter
Chelsea Walls
2001 • Terry Olsen
Driven
2001 • Demille Bly
A Glimpse of Hell
2001 • LT(JG) Dan Meyer
Wasteland
1999 - 1999 • Jesse's ex
Ground Control
1998 • Cruise
The Last Days of Disco
1998 • Tom
Standoff
1998 • Agent Jamie Doolin
In the Gloaming
1997 • Danny
Killer: A Journal of Murder
1995 • Henry Lesser
I Love You, I Love You Not
1996 • Angel of Death
The Boys Next Door
1996 • Barry Klemper
Safe Passage
1994 • Alfred
Normandy: The Great Crusade
1994 • Robert Sales (voice)
The Age of Innocence
1993 • Theodore "Ted" Archer
Much Ado About Nothing
1993 • Claudio
Going Live!
1987 - 1993 • Self
Swing Kids
1993 • Peter Müller
Married to It
1991 • Chuck Bishop
Mr. & Mrs. Bridge
1990 • Douglas Bridge
Dead Poets Society
1989 • Neil Perry
My Best Friend Is a Vampire
1987 • Jeremy Capello
Bluffing It
1987 • Rusty Duggan
The Manhattan Project
1986 • Max
My Two Loves
1986 • Larry Taylor
The Hottest State
2006 • Thanks