Dr. Miller currently holds the position of Head of the Department of Psychiatry at St Vincent's Private Hospital Darlinghurst and St Vincent's Clinic Darlinghurst as well as the position of Adjunct Clinical Senior Lecturer in the School of Medicine at the Notre Dame University and is a member of the following professional bodies:
- The Royal Australian and New Zealand College of Psychiatrists
- Australia and New Zealand Association of Psychotherapy
- Australasian Professional Society on Alcohol and other Drugs
- The Australian College of Legal Medicine
- Australian and New Zealand Association of Psychiatry, Psychology and Law