Zen plays both the piano and trumpet.
His height is 5' 11½ (1.82 m).
Zen is the son of actress Nan Martin.
He is married to Cynthia Farrelly since 1995, and they have three sons Finn Harry (July 24, 1997), Rory, and Tuck John (July 11, 2003). His brothers-in-law are Peter Farrelly and Bobby Farrelly.