- John and his All My Children (1970) co-star Susan Lucci were both born on December 23rd.
- Welcomed first child, daughter Kaya McKenna Callahan, on December 6, 2001. Her mother is his ex-wife, Eva LaRue.
- Used to host Weddings of a Lifetime (1995) with his wife Eva LaRue.
- Co-hosted the Miss America Pageant with his wife, actress Eva LaRue. (1998)
- Attended the University of California, Berkeley, as a pre-law student.
- An avid golfer and baseball fan, John has played with the Hollywood All-Stars Softball Team for many years.
- John grew up in Baldwin, Long Island, New York.
- Ex-brother-in-law of Nikka La Rue.
- John and his good friend, Kelly Ripa, played opposite each other as soap characters in Marvin's Room (1996).
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