- His father, Greg Mulleavy, played Major League Baseball for the White Sox and Red Sox, was third base coach for the Brooklyn Dodgers and LA Dodgers, and won 4 World Series with the Dodgers.
- Teaches a very popular scene study class in New York City.
- Greg was married to actress Meredith MacRae (Petticoat Junction (1963), My Three Sons (1960)). They had one daughter, Allison Mullavey.
- Ex-son-in-law of Gordon MacRae and Sheila MacRae.
- Recurring role of playing the character, Grandfather Shay", on the Nickelodeon show, iCarly (2007). (November 2007)
- Greg has lived with his partner, actor/writer/producer Ariana Johns since 1999.
- Changed the spelling of his surname from Mulleavy to avoid confusion with his father, who also had the same name.
- Ex-brother-in-law of Heather MacRae.
- Parents are: Greg Mulleavy, and Doris Giroux.
- [2025] Currently living in New York City.
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