Raised around Alberta, Rennie began acting in his 20s.

He has got roles around the kind of American television series, including Due South, Twitch City and ''Da Vinci's Inquest. He has too been around the total of moving picture, including Double Happiness (as a love interest of Sandra Oh), Curtis's Charm, Hard Core Logo, eXistenZ, The Five People You Meet in Heaven and Flower & Garnet. He played a Cylon Leoban Conroy in the reimagined Battlestar Galactica.

He was the high school schoolmate of Bruce McCulloch from The Kids in the Hall, with whom he was around the cheap band.

Callum has processed guest appearances in tv shows,some of victims shows range from either Forever Knight, The X Files, Mutant X and Highlander'' as a mortal in the year Ii episode "An Eye For an Eye" and played an immortal named Tyler King in the year Foursome episode "The Innocent"

Filmography

The Cleaner (2006) (filming) The Hunters (2006) TV Series (post-production) - Quin Hunter Unnatural & Accidental (2006) (post-production) - Norman Snow Cake (2005) (post-production) - John Neil Whole New Thing (2005) - Denny Lucid (2005) - Victor Whiskey Echo (2005) (mini) TV Series - Dr. Rollie Saunders Pool Hall Prophets (2005) (V) - Michael Mortensen Blade: Trinity (2004) - Asher Talos The Five People You Meet in Heaven (2004) (TV) - Eddie's Father H2O (2004) (TV) - Don Pritchard/Lt. Daniel Holt Wilby Wonderful (2004) - Duck MacDonald The Butterfly Effect (2004) - Jason Treborn Paycheck (2003) - Jude, Guard Battlestar Galactica (2003) (mini) TV Series - Leoben Conoy Falling Angels (2003) - Jim Field Flower & Garnet (2002) - Ed Now & Forever (2002) - Carl Mackie Slap Shot 2: Breaking the Ice (2002) (V) - Palmberg Bliss (2002) TV Series - Mike Torso: The Evelyn Dick Story (2002) (TV) - Inspector Wood Dice (2001) (mini) TV Series - Egon Schwimmer Picture Claire (2001) - Laramie Trapped (2001/I) (TV) - Anthony Bellio Nature Boy (2000/II) (TV) - Eden Abez Murder Seen (2000) (TV) - Detective Keegan Memento (2000) - Dodd Suspicious River (2000) - Gary Jensen The Last Stop (2000) - Jake The Highwayman (2000) - Telemarketer The Life Before This (1999) - Martin Maclean eXistenZ (1999) - Hugo Carlaw Last Night (1998/I) - Craig Zwiller Twitch City (1998) TV Series - Newbie Tricks (1997) (TV) - Adam Due South (1997) TV Series - Det. Stanley Raymond Kowalski Men with Guns (1997/I) - Mamet Excess Baggage (1997) (as Callum Rennie) - Motel Manager Masterminds (1997) - Ollie Hard Core Logo (1996) - Billy Tallent My Life as a Dog (1996) TV Series - Johnny Johansson Letters from Home (1996) (as Callum Rennie) Unforgettable (1996) - Drug Dealer For Those Who Hunt the Wounded Down (1996) (TV) - Jerry Bines Curtis's Charm (1995) - Jim The Ranger, the Cook and a Hole in the Sky (1995) (TV) - Big Hat When the Dark Man Calls (1995) (TV) - Bob Levesh Falling from the Sky: Flight 174 (1995) (TV) - Pumper Little Criminals (1995) - Kostash The Omen (1995) (TV) - Driver Timecop (1994) - Stranger Double Happiness (1994) (as Callum Rennie) - Mark Frank's Cock (1994) (as Callum Renney) Paris or Somewhere (1994) (TV) - Christy Mahon The Raffle (1994) - Floor Director Still (1994) (as Callum Rennie) - Boyfriend Valentine's Day (1994) (as Callum Rennie) - Astronaut Purple Toast (1993) - Tom Struck