The first film on which John worked was “Rat Race” with fellow former Trinity College student John Powell. Others John has worked with John Powell on include “Happy Feet” 1 & 2, “Horton Hears a Who”, three of the “Bourne” series, three “How to Train Your Dragon” movies and most recently “Call of the Wild.”

John has orchestrated “Night at the Museum” 1 & 2, “A Christmas Carol”, “Avengers Assemble” and several others for Alan Silvestri. He has worked as an orchestrator on several scores written by James Newton Howard. In recent years he has worked on "Black Panther", "Solo: a Star Wars Story” and “Captain Marvel” amongst others.