David Ian Hewlett (born 18 April 1968) is an English-Canadian actor, writer, director, and voice actor best known for his role as Dr. Rodney McKay on the Canadian-American science fiction TV shows Stargate SG-1, Stargate Atlantis and Stargate Universe.
Hewlett first gained fame for his role as Grant Jansky in the 1996 Canadian TV series, Traders and a year later, appeared as David Worth in the 1997 Canadian psychological horror film Cube. He later played bad-tempered airplane pilot, Douglas Hunsiker in the 2011 movie, Rise of the Planet of the Apes. In addition, Hewlett is also known for his role in the 1988 horror film Pin and the 1991 science-fiction film Scanners II: The New Order.