Patrick has been a Periodontist for almost 30 years. He also teaches as a Senior Clinical lecturer at Sydney University . He is an examiner for the RACDS in the Specialist Stream (Periodontics), an examiner for the Diploma of Oral implants , for the Doctor of Clinical Dentistry program in Periodontics at Sydney University. He was the first Periodontist to present the use of CT graft in implant treatment, at the Inaugural Australasian Osseointegration Society meeting in Sydney in 1998. He has given over 100 presentations on Periodontics and Implant treatment in Australia and overseas, and has run implant workshops both locally and overseas.