Biography
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.
Known For
Complete Filmography

Freaky Tales
2025
as Josh
In 1987 Oakland, a mysterious force guides The Town's underdogs in four interconnected tales: teen punks defend their turf against Nazi skinheads, a r...

By Design
2025
as Gary
A woman swaps bodies with a chair, and everyone likes her better as a chair.

Running on Empty
2024
as Mort
When Mort finds out he has less than a year to live, his fiancé Nicole leaves him and he’s forced to accept his fate. Mort joins a dating service that...

The Featherweight
2023
as Billy Papaleo Jr.
Set in 1964, a camera crew follows Willie Pep, retired featherweight boxing champion. Down and out in Hartford CT, married to a woman half his age and...

An Intrusion
2021
as Layne
Sam and his family are terrorized by a malicious stalker... but as an investigation mounts, he fears the attacks may be related to secrets he has viol...

Castle in the Ground
2021
as Polo Boy
After the untimely death of his mother, a grieving teen befriends his charismatic but troubled neighbor, only to become ensnared in a world of addicti...

Flashback
2020
as Andre
Frederick Fitzell is living his best life—until he starts having horrific visions of Cindy, a girl who vanished in high school. After reaching out to ...

Katie Says Goodbye
2018
as Matty
A kindhearted seventeen-year-old in the American Southwest turns to prostitution to fulfill her dream of a new life in San Francisco.

Pisces
2017
as Alex
Two childhood friends, each held captive in time by a tragic moment, travel through the world of memory to find their respective path to freedom.

Heartthrob
2017
as Henry Sinclair
Sam Maddox, a troubled girl whose father committed suicide, has earned a reputation at her high school for being a bit promiscuous. When Sam begins se...
Los
2017
as Left
Written by three juvenile inmates facing life sentences, "LOS" is a loss of innocence story that follows twelve-year-old Chris as he discovers that sm...

The Good Neighbor
2016
as Sean
Two high school filmmakers decide to create the illusion of a haunting on an unsuspecting neighbor.

The Elvis Room
2016
as Kurt
Based on the story by Stephen Graham Jones, two young women learn the truth behind a spooky hotel industry superstition.

Tales of Halloween
2015
as The Stranger
Ten stories from horror's top directors. Ghosts, ghouls, monsters, and the devil delight in terrorizing unsuspecting residents of a suburban neighborh...

Len and Company
2015
as William
A successful music producer quits the industry and exiles himself in upstate New York, but the solitude he seeks is shattered when his estranged son a...

The Stanford Prison Experiment
2015
as John Lovett
In 1971, Stanford's Professor Philip Zimbardo conducts a controversial psychology experiment in which college students pretend to be either prisoners ...
Smoke
2015
as Michael
Three teenage boys get locked out of their car and pass the time smoking cigarettes and one-upping each other with tales of sexual conquest.

The Heyday of the Insensitive Bastards
2015
as Michael
Seven vignettes explore the difference between fantasy and reality, memory and history, and the joy and agony of the human condition.

Share
2015
as Dylan
A 15-year-old girl returns to school after an explicit video of her goes viral.

It Follows
2015
as Paul
When carefree teenager Jay sleeps with her older boyfriend for the first time, she learns that she is the latest recipient of a fatal curse that is pa...

Dark Summer
2015
as Daniel
Follows the tale of a 17-year-old on house arrest for the summer. When his mother is away on business, a horrifying incident occurs, followed by an ev...

Seasick Sailor
2013
as Penna
A lonely teenager working as a debt collector for an underground gambling ring in Los Angeles tries to fit in with a new group of friends.
Matty Hanson and the Invisibility Ray
2011
as Matty Hanson
Super genius Matty Hanson (Keir Gilchrist) works on top secret science project at a major university research lab. When Matty discovers a formula for ...

Just Peck
2011
as Michael Peck
At 104 pounds dripping wet, baby-faced sophomore Michael Peck (age 15) is not exactly the coolest guy at American High. Peck’s teachers make him feel ...

It's Kind of a Funny Story
2010
as Craig Gilner
A clinically depressed teenager gets a new start after he checks himself into an adult psychiatric ward.

Hungry Hills
2009
as Snit
In 1954 after two years in a home for boys, Snit Mandolin, 15, returns home to his seemingly unhinged and reclusive aunt Matilda. Defeated by a commun...

The Rocker
2008
as Moby Type Kid
In the 1980s, a drummer is abandoned by his band just before they become rock superstars. Twenty years later, the drummer sees his second chance at st...

Dead Silence
2007
as Young Henry
Jamie returns to his hometown in search of answers to his wife's murder, which occurred after receiving a weird package containing a ventriloquist dum...

A Lobster Tale
2006
as Mike Stanton
Cody Brewer, a quiet New England fisherman isn't doing too well for himself. His wife feels neglected, and his son keeps getting picked on by the scho...

Saint Ralph
2005
as Kid Collins
This Canadian made comedy/drama, set in Hamilton, Ontario in 1954, is a sweet and - at times - goofy story that becomes increasingly poignant as the m...

Horsie's Retreat
2005
as Louie (uncredited)
Horsie, a reformed drug addict, is thrown into his old world to help a friend get clean, only to find himself enmeshed in a phantasmagoria of lust & p...

Samantha: An American Girl Holiday
2004
as Factory Boy
Kindhearted Samantha Parkington's world starts to change the day Nellie O'Malley walks into her life. Nellie, her father, and her two little sisters h...

The Right Way
2004
as Young David
Amy and David are two underachievers from suburbia. Amy has had a rough life raised by her neglectful drug addicted single mother. David has been rais...
The Sadness of Johnson Joe Jangles
2004
as Clint the Boy Doctor
Two male lovers attempt to start a family in the Wild West.