Background and career
Keir David Peters Gilchrist (; born 28 September 1992) is a Canadian actor. On television, he portrayed Marshall Gregson on the Showtime comedy-drama United States of Tara (2009–2011) and the headlining role of Sam Gardner on 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.
Gilchrist was born in Camden Town, London, to Canadian parents Catherine (née Peters) and Ian Gilchrist. His maternal grandfather was banker, economist, and politician Douglas Peters, and his uncle is economist David Wilfrid Peters. Gilchrist spent his early years in London, before relocating to Boston, Massachusetts, United States, during his childhood, then to New York City, before finally settling in Toronto, Ontario, Canada.
Gilchrist 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, on the Showtime comedy-drama series United States of Tara. 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 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 had a role in the short drama film Share. In 2016, he co-starred in the film The Good Neighbor. In 2017, he starred in the film Heartthrob as Henry, directed by Chris Sivertson. In August of that year, he starred as Sam Gardner, a teen on the autism spectrum who is ready to have a girlfriend, in the Netflix comedy-drama Atypical. He continued with the role for four seasons until the show concluded on 9 July 2021.
Sources
Net-worth figure: Celebrity Net Worth (October 2026), in USD. Biography and career facts: the person's Wikipedia article and linked reporting. Snapshot date for all StarWorth figures: 28 October 2026.
