John studied with William Esper and Deborah Van Valkenburgh.
He is Irish-American.
John shares his birthday with many celebrities such as Sarah Michelle Gellar and Adrien Brody.
John's son, Jake attends the University of Miami studying business.
Two of John's siblings are chiropractors.
He is a former assistant director at Chelsea Westside Theater and a former teacher at Pratt Institute.
John has an Abyssinian cat named Pharaoh.
He enjoys practicing yoga and tai chi on a regular basis. When he's not busy, he spends time with his family.
He was a football and track athlete in school.
On stage he received a Drama Desk award for American Days, an Obie award for The Dining Room, and a Theatre World Award Yentl.
He was first discovered after his portrayal of Joseph in The Nativity (1978).
He is a regular reader on Selected Shorts which is broadcast nationwide on Public Radio International.
John is a founding member of the Nantucket Film Festival.
John has two sons named Jake and Caiden. He also has a daughter, Miranda.
In 1988, John won an Emmy for Outstanding Supporting Actor in a Miniseries or a Special for Baby M. In 1998, John won an American Independent Award for Southie.
He was married to Laura Pettibone for 30 years.
As of 2001, John is married to Melissa MacLeod.
He is 6'0½" tall.
(On Adam Kane, the leader in Mutant X)
John: It's fun for me because I am a father in real life, so I understand that parental thing.
(On his character, Adam Kane in Mutant X)
John: I think of him more as a kind of leader or a coach or a big brother. Rather than think of myself as their father, I think more of myself as an older brother who is maybe a little bit wiser about the ways of the world. Who can inspire them and lead them. A leader, if you will. A director who is directing them into a path.
(On his role of Lex Luthor)
John: I did every single episode the first season. I was living in New York when I shot Lois and Clark and I was commuting to Los Angeles every week to shoot. It was very difficult on me and my family. So I asked them if I could get out of my contract at the end of the first season, and they wouldn't let me out altogether, but they let me diminish my participation so that I only did certain episodes that were called Lex Luthor episodes.
(On his character, Adam Kane in Mutant X)
John: I think Adam's story is one of betrayal, you know? He's somebody who believed he's an idealist. He's a wounded idealist. I think he's felt the sharp pain of a knife squarely placed between his shoulder blades. I think a lot of what he does is trying to recover from this betrayal.
(On his portrayal of Lex Luthor)
John: I don't think there has been a character quite like this. This villain is written as a human being, and not just a one-dimensional comic villain or a two-dimensional comic villain, the way he might have been portrayed in the comic books or even other films. I thought Gene Hackman was brilliant, but it was a different kind of comic villain.
John: When I read a role, I try to find something that I can bring to the role and something that the role brings to me. Something that I don't know anything about and that the character can teach me.