Mark Anthony McDermott, better known by his professional name, Dylan McDermott, was born in Waterbury, Connecticut, to Diane and Richard McDermott.
As a teenager, McDermott began taking trips to visit his father, who owned the West Fourth Street Saloon in New York City. The two would see movies together, McDermott would work in his father's bar serving drinks and breaking up fights. As a teenager, McDermott was uncomfortable with himself, and began imitating his acting heroes (Marlon Brando and Humphrey Bogart) to adopt their demeanors. McDermott attended and graduated from Holy Cross High School in Waterbury. While in his teens, McDermott met Jessica Lange who worked as a waitress in a nearby bar.
McDermott is noted for his rugged good looks and fashionable style, which he has been featured for in magazines, such as Men's Health. In 1999, he was one of a six-way tie for sixth place in GQ's "Man of the Year" issue.
Dylan on his role as Ben
- Dylan has said about the role of Ben Harmon: "I campaigned for this role. I knew this was THE role for me." 
- McDermott commented on whether the end goal for the Harmon family was to get rid of the ghosts or learn to live with them. "Maybe a little bit of both. When I met with Ryan, Brad, and Connie, originally we had talked about that this really is a show about a fractured family and what infidelity can do to people. It's a metaphor for all the horror of being in a relationship and being in a family and being in a marriage. Connie and I try to keep it as real as possible because we're probably the most grounding part of the show, but I think that's really important so it doesn't become just a freak fest…We try to keep it grounded in reality so people can be rooted in something, rooted in the family…I think you just have to go with it. There's no parachute in this show. There's no net. We just are all in this together, and that's what makes it so much fun is that everybody's making the same show here. And we're all going for it. And so I think that's why it's working."
Dylan on playing serial killers
- Dylan said that he's not concerned that Ryan Murphy thinks he's perfect for playing "psycho murderers".
- "To clarify, I think that Bruce probably is a psychopath and Johnny is a sociopath. So Johnny was made, Bruce was born into it. So I think they both have done horrible things, but I think that they're different in terms of their psychology, if you will. Johnny, he is born from the abuse of his childhood, where Bruce is just on a tear and I'm not even sure why he's doing what he's doing."
- "I think always with these people is they come from — I think Bruce especially is someone that's a child of abuse, child neglect, child abandonment. You know, got into a lot of trouble as a kid. No empathy. I think that he just learned from a very young age to seduce and to trick. And I think that he was always in trouble. I think that he just has absolutely no empathy at all... And I think that he has an inability to feel, besides anything but rage."
- Dylan McDermott is one of the twenty-four cast members that portrayed the same character in different seasons. He portrayed Ben Harmon in Murder House and Apocalypse.
- McDermott, Connie Britton and Evan Peters are the only three cast members to appear in all episodes of Murder House.
- Murder House - Dr. Ben Harmon
- Halloween: Part 1 - Dr. Ben Harmon
- Halloween: Part 2 - Dr. Ben Harmon
- Piggy Piggy - Dr. Ben Harmon
- Open House - Dr. Ben Harmon
- Rubber Man - Dr. Ben Harmon
- Spooky Little Girl - Dr. Ben Harmon
- Smoldering Children - Dr. Ben Harmon
- Birth - Dr. Ben Harmon
- Afterbirth - Dr. Ben Harmon
- The Origins of Monstrosity - Johnny Morgan (voice only)
- The Coat Hanger - Johnny Morgan
- Spilt Milk - Johnny Morgan
- Continuum - Johnny Morgan
- Madness Ends - Johnny Morgan
- Return to Murder House - Dr. Ben Harmon
- ↑ Dylan McDermott on Regis and Kelly show, 11 Oct 2011, see Video
- ↑ Guard, Sean (6 November 2011). "Dylan McDermott and Connie Britton talk'American Horror Story'". Napier's News.
- ↑ 3.0 3.1 3.2 Gennis, Sadie (Nov 6, 2019). American Horror Story: 1984's Dylan McDermott Teases 'There Are No Good Endings With Bruce'. TV Guide.