Simon Northwood was born in Wimbledon, England. His family moved between the United States and Canada before settling down in Burlington, Ontario in 1980.
In 1985 Simon took an interest in martial arts, which he continues to practice today. He attained his Yodan belt or fourth degree black belt in Wado Kai Karate and competed for 24 years. In 2000 he was a part of the Canadian National Karate team. It was during his competitive years that his interest in acting and stunt performing was piqued.
Simon went to Sheridan College and began taking animation courses in 1992. He worked in the industry for 10 years and was hired by Disney Studios Canada as an F/X Animator. Simon opted out of animation and began taking acting classes and training to pursue a career as an actor.
Simon has appeared in over 50 film and television productions. He has performed as an action actor in feature films and television productions. He was also a stunt performer in films.