Born in Surrey, England, but raised in Canada, David Hewlett began his acting career in his Toronto high school in a number of student films directed by Vincenzo Natali. He began appearing in Canadian TV series like "The Edison Twins" and "The Campbells" during the 1980s and was also cast in several low-budget horror films like "The Dark Side." He continued to act in more B-movie thrillers during the 1990s with appearances in "Scanners II: The New Order," "Blood Brothers," and "Quiet Killer" before landing a breakthrough part in another Natali film: the critically acclaimed "Cube" in 1997. Commercial success soon followed when Hewlett landed a starring role on the hit Canadian series "Traders"; he played the math wizard Grant Jansky from 1996 to 2000, earning two Gemini Award nominations. His star began to rise quickly after the success of "Traders," and he started to earn more significant roles in the 2000s, including the lead in Natali's 2003 film "Nothing." It was in 2004 that Hewlett would land his largest and most recognizable role, the Canadian astrophysicist Dr. Rodney McKay in the cult sci-fi series "Stargate: Atlantis." While still acting in "Stargate," he wrote, directed, and starred in his own film, "A Dog's Breakfast," in 2007. He continued to act in more major films in the late 2000s and early 2010s with significant roles in "Splice" and "Rise of the Apes."