Dr Mark Johnstone graduated dentistry with honours in 2008, being awarded the Ernst Joske Prize and was on the Deans Honours List. He completed the Doctor of Clinical Dentistry in Endodontics in 2014 from the University of Melbourne, and was awarded the Ephraim Ehrmann Memorial Prize in 2014. He completed a Masters of Health and Medical Law at the University of Melbourne in 2019. His postgraduate research was related to communication and informed consent in endodontics, and was published in the Journal of Law and Medicine in 2016. He works in private practice in Maribyrnong, Victoria and Chatswood, NSW, and is an adjunct senior lecturer at Charles Sturt University.