Greg completed his orthopaedic training in Sydney in 1999. He went to London for three years of Spine fellowships at Royal National Orthopaedic Hospital, Stanmore; Great Ormond Street Children's Hospital; and National Hospital for Neurology & Neurosurgery. This was followed by an appointment as consultant spine surgeon at The University College Hospital, London for four years. Returning to Sydney in 2006, Greg took a position at the Spine Service in Kogarah. In 2001, he took up a spine surgery appointment at the Alfred Hospital. His main interests are spinal deformity (all ages), cervical spine, spine tumours and revision spine surgery.