Keir Gilchrist {given birth name being Keir David Peters Gilchrist ) was born on September 28, 1992 in the London Borough of Camden, Camden Town, U.K. and he is an English-born Canadian actor. He is known for playing Marshall Gregson on Showtime's original series "United States of Tara" and Craig Gilner in the 2010 comedy-drama film "It's Kind of a Funny Story".
Keir portrays the main autistic protagonist, Sam Gardner, in the Netflix Original Series, Atypical.