In Greg's time he has been fortunate to train under, with, and alongside some of the very best masters in the world. The most major martial arts influence in his life is Kyoshi 9th Dan Karate Master, Sensei Mark Greville (pictured below). Greg came to train under Sensei Greville in the late 1980's. Greg was immediately amazed by his Sensei's depth of knowledge and abilities. Greg worked hard to become accepted as a private student, training daily to build and develop his own skills. Over twenty five years later and the pair are still training together. The Killcare Shorin Ryu Shorinkan Karate School is officially the sister school of the Northern Beaches Collaroy Dojo and part of the Okinawan Martial Arts Body in Okinawa under 10th Dan Hanshi Shugoro Nakazato.
Sensei Mark Greville & Sensei Greg Van Borssum with the Academy Award for Happy Feet 1 where Greg was Digital Crowds Director/2nd Unit Director/ motion Capture Director. Greg was also Digital Crowds Director/2nd Unit Director/Motion Capture Director of Happy Feet 2... and most recently as Principal Fight Choreographer/ Weapons Specialist & actor on Mad Max Fury Road. Winner of 6 Academy Awards, Screen Ator Guild Awards and Taurus Stunt Awards of best stunts and fight scenes of the year in a movie.