|Date of Birth||May 4, 1970|
Arnett was born in Toronto, the son of Edith Alexandra (née Palk) and Emerson James Arnett, who was a corporate lawyer and brewer, among other occupations. Arnett briefly attended Lakefield College School in Lakefield, Ontario (but was asked not to return after a semester for being a troublemaker). the Subway Academy II which allowed him to take theatre classes at theTarragon Theatre, and eventually graduated from Leaside High School. He attended Concordia University, Montreal for one semester, but dropped out. As a teenager, he was encouraged by his mother to pursue an acting career, auditioned for commercials in Toronto and enjoyed acting. In 1990, he moved to New York City to study acting at the Lee Strasberg Theatre and Film Institute, he appeared in plays in New York and his first acting role was in Felicity Huffman's independent film Erie, which was filmed on the Erie Canal.