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Dr Mark O’Sullivan is a co-owner of a large endodontic group practice servicing Newcastle and the Hunter Valley region of NSW. Prior to moving into full time private practice, Mark served 15 years in the Royal Australian Air Force in various dental roles, transferring to the Reserves at the rank of Wing Commander. Mark is an active member of several professional organisations and has previously served as the Federal Secretary/Treasurer of the Australian Society of Endodontology. 

As well as being a leader in endodontic education, Mark is also a co-founder and director of a niche endodontic supply company and maintains an active role educating dentists on embracing conservative endodontic therapy using state-of-the-art materials and techniques.