He received a Bachelors in Fine and Performing Arts from Simon Fraser University in Vancouver, British Columbia, Canada.
Dean considers Charlie Chaplin and Winston Churchill his childhood heroes.
Dean stands 5' 11 1/2" (1.82m).
Dean is credited as the inventor af the Chill Pak, an external cooling device for laptop computers.
Haglund is also a stand-up comedian, specializing in improvisational comedy.
Dean was best man to Gary Jones at his wedding and vice versa.
Dean appeared in the music video, "Hands Clean," by Alanis Morissette.
Although he doesn't wear glasses in reality, Dean wears black ones on The X-Files.
As of 2006, Dean doesn't have long hair anymore.
A long-time comedy improviser, Dean got his start with the likes of Ryan Stiles and Colin Mockery in the internationally award winning Vancouver TheatreSports League. He now regularly performs in Los Angeles with The Groundlings and Second City. Catch him nearly every Friday night at The Friar's club where he performs with Second City alumni such as Dan Castellaneta.
His character is so popular that Dean is a main attraction at X-File and Sci-Fi conventions all over North America. He appears on trading cards, T-Shirts and even has his own comic book (The Lone Gunman published by Dark Horse Comics).