Mark attended the same school as Eddie Vedder, in Encinitas, California (San Dieguito High School). Although 2 years behind him, they were in acting classes together.
His oldest son is Jon Allyn, who is a successful film composer and music producer.
Is partners with writer/actor/director Daniel Pastel (Dannix, Get Teda) in the comedy podcast, "A Couple of Regular Guys".
Eddie Vedder appeared on a 1991 album produced by Mark, titled "Musicians Who Care", a compilation albums of local San Diego bands, while he was with his first band, Bad Radio.
Prior to Mark's move back into entertainment, he was a successful Project Manager, and still maintains his professional certification (Project Management Professional).
In the 90's Mark produced the indie/alternative band The Cry's first album "Beautiful Reasons", that included the track "Alone" which has been used in several popular skate movies and most recently in the short film And Yet They Speak, directed by Windy Marshall and stars Jennifer Marshall.