- Kissed Sophia Loren at the tender age of 2.
- Son of The Beatles' producer, George Martin, and Sheena Chisholm.
- Gregory is married to Cherie Martin, his producing partner and marketing executive, and has one son, Connor Martin, a student in creative writing in film and television at The University of The Arts, Philadelphia.
- Played the title role in "Hamlet" at the age of 25.
- Worked alongside actors of the caliber of Daniel Day-Lewis, Kevin Spacey, Ellen De Generes, Keanu Reeves, Chevy Chase, Hank Azaria, Ginacarlo Giannini, Daryl Hannah, Michael McKean, Helen Hunt, and the late Anthony Quinn.
- Older half-brother of Giles Martin.
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