Keir Gilchrist
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Keir David Peters Gilchrist (born September 28, 1992) is an English-born Canadian actor. 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.

Gilchrist was born in Camden Town, London, to Canadian parents Catherine (née Peters) and Ian Gilchrist. His maternal grandfather is Canadian banker, economist, and politician Douglas Peters, and his uncle is economist David Wilfrid Peters. He has Scottish, English, and Irish ancestry. Gilchrist spent his early years in London, before relocating to Boston, Massachusetts during his childhood, then to New York City, before finally settling in Toronto, Ontario.

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.