- Attended the London Academy of Music and Dramatic Art (LAMDA)
- Son of Nan Martin and Harry Gesner.
- Son, Finn Harry, born in Capetown, South Africa. Finn's middle name is Harry, after Zen's father. (July 24, 1997)
- Younger stepbrother of Casey Martin Dolan.
- Son, Rory Gesner, born in Santa Monica, California. (October 9, 2000)
- Son, Tuck Gesner, born in Santa Monica, California. (July 11, 2003)
- Uncle-in-law of Jesse Farrelly and Abe Farrelly.
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