Keir Gilchrist

In 2009, Gilchrist won the lead role of Craig Gilner in the film It's Kind of a Funny Story, which premiered at the Sundance Film Festival in January 2010. In 2014, Gilchrist co-starred with Maika Monroe and Jake Weary in the film It Follows. In 2015, he played the lead role of Daniel Austin in the film Dark Summer, starred as John Lovett in The Stanford Prison Experiment and William in Len and Company, and portrayed the boyfriend of Taissa Farmiga's character in the Cannes Film Festival-winning short drama film Share. In 2016, he and James Caan co-starred in the film The Good Neighbor. In 2017, he starred in the film Heartthrob, directed by Chris Siverston. In August 2017, he began starring as Sam Gardner, a teen with autism, in the Netflix dramedy Atypical.

Gilchrist discovered his passion for acting at a young age, and his drama teacher persuaded him to become a professional actor. He attended the Annex Children's Theatre. Gilchrist's first significant television role was that of Josh McKellar on Fox's short-lived television sitcom The Winner, which aired in 2007. From 2009 until its ending in 2011, Gilchrist co-starred as Marshall Gregson, the son of the lead character portrayed by Toni Collette, on the Showtime comedy-drama series United States of Tara.

Keir David Peters Gilchrist (born 28 September 1992) is an English-born Canadian actor and musician. Gilchrist is known for playing Marshall Gregson on Showtime's original series United States of Tara, Craig Gilner in the 2010 comedy-drama film It's Kind of a Funny Story, Paul in It Follows, and Sam Gardner in the Netflix original series Atypical. He is also the vocalist of grindcore band, Whelm, and the death metal band, Phalanx.