McKenna was the subject of the 2009 PBS documentary ADD and Loving It?! McKenna has ADHD, but was not diagnosed until he was well into his forties. He has become somewhat of a spokesman on this condition in Canada. McKenna and Rick Green, writer and performer and co-creator of The Red Green Show, made a documentary to explain some of ADHD's positives and negatives titled "ADD and Loving It." Both men open up about how it has affected them and their relationships. Charitable work McKenna has become involved with many charity organizations and causes—including wheelchair athletes, Adult ADHD, MS Society, Lupus Canada and McMaster Sick Kids—some of which he has personal connection with. McKenna suffered a debilitating back injury in the early 2000s that left him unable to walk for a year. He went through times of being in a wheelchair and having to learn to walk again. It was from this experience that he became involved with wheelchair athletes. His mother, Patricia, has suffered from lupus since the 1970s. McKenna's friend and fellow Second City alumnus Colin Mochrie and his wife Debra McGrath often help McKenna with lupus charity fundraising. Personal life McKenna is a member of Toronto's The Second City comedy troupe. McKenna's mother's name is Patricia, and he has three brothers. He married his high school sweetheart, Janis, in 1983. They have a son, Brendon, born in 1985. Brendon McKenna was seen in two episodes, Dancing with Mr. D. and The Unseen Lever, of his father's series Traders as Marty's son, Mark Stephens. Filmography The Red Green Show (Harold Green) Traders (Marty Stephens) Sam & Max: Freelance Police!!! (Lorne, the Friend for Life) Little Mosque on the Prairie (The Principal) Stargate SG-1 (2 eps.) (Dr. Jay Felger) Crash Canyon (Norm Wendell / Vernon Wendell) Due South (Pizzas and Promises, season 1, ep. 5) (Gary Redfield) Getting Along Famously (Jeffrey Littleman) Iggy Arbuckle (Robear) Atomic Betty (Quincy Barrett) Best Ed (Doug aka Buddy) The Border (Don Campbell) Spliced (Two-legs "Joe") Clang Invasion (Rivet) Bill 'n' Lloyd (Krasky the Klown) Detective Squirrel Jr. (Dad) Wingin' It (Mr. Telson) New Outer Limits: Mindreacher Episode (Dr. Seigal) Sidekick (Pamplemoose) Milo 55160 (Milo 55160) Scaredy Squirrel (Nestor) Go, Dog. Go! (Grandpaw Barker) John A.: Birth of a Country (TV movie) (Alexander Galt) Remedy (Frank Kanaskie) The Masked Saint (Judd Lumpkin) Forever Knight ("Dance by the Light of the Moon, season 1, ep.