Keir David Peters Gilchrist (born 28 September 1992) is a Canadian actor and musician. On television, he portrayed Marshall Gregson on the Showtime comedy-drama United States of Tara (2009–2011) and headlined the Netflix comedy-drama Atypical (2017–2021). His film roles include the comedy-drama It's Kind of a Funny Story (2010) and the supernatural horror It Follows (2014). Outside of his acting career, Gilchrist is the vocalist of grindcore band Whelm and death metal band Phalanx.
Freaky Tales
Josh
2025
By Design
Gary
2025
Running on Empty
Mort
2024
The Featherweight
Billy Papaleo Jr.
2023
The Walking Dead: Dead City
Benjamin Pierce · (3 episodes)
2023
Love & Death
Ron Adams · (6 episodes)
2023
An Intrusion
Layne
2021
Castle in the Ground
Polo Boy
2021
Flashback
Andre
2020
Katie Says Goodbye
Matty
2018
Pisces
Alex
2017
Heartthrob
Henry Sinclair
2017
Atypical
Sam Gardner · (38 episodes)
2017
Room 104
Alex · (1 episode)
2017
Los
Left
2017
The Good Neighbor
Sean
2016
The Elvis Room
Kurt
2016
Tales of Halloween
The Stranger
2015
Len and Company
William
2015
The Stanford Prison Experiment
John Lovett
2015
Smoke
Michael
2015
The Heyday of the Insensitive Bastards
Michael
2015
Share
Dylan
2015
It Follows
Paul
2015
Dark Summer
Daniel
2015
Seasick Sailor
Penna
2013
Delete
Daniel Gerson · (2 episodes)
2013
Newsreaders
Ben Hayflack Age 18 · (1 episode)
2013
Matty Hanson and the Invisibility Ray
Matty Hanson
2011
Just Peck
Michael Peck
2011
It's Kind of a Funny Story
Craig Gilner
2010
Hungry Hills
Snit
2009
The Listener
Daniel / Lisa · (1 episode)
2009
United States of Tara
Marshall Gregson · (36 episodes)
2009
The Rocker
Moby Type Kid
2008
The Altar Boy Gang
Neil · (1 episode)
2007
Dead Silence
Young Henry
2007
The Winner
Josh McKellar · (6 episodes)
2007
A Lobster Tale
Mike Stanton
2006
Life with Derek
Jamie · (3 episodes)
2005
Saint Ralph
Kid Collins
2005
Horsie's Retreat
Louie (uncredited)
2005
Samantha: An American Girl Holiday
Factory Boy
2004
The Right Way
Young David
2004
ReGenesis
10 Year Old Boy · (1 episode)
2004
The Sadness of Johnson Joe Jangles
Clint the Boy Doctor
2004
Miss Spider's Sunny Patch Friends
Squidge (voice) · (1 episode)
2004
Missing
Danny Sheperd · (1 episode)
2003
Doc
R.J. Mitchell · (1 episode)
2001
Queer As Folk
Jim Stockwell Jr. · (1 episode)
2000
Family Guy
Kyle (voice) · (1 episode)
1999
Family Guy
Toby (voice) · (1 episode)
1999