Since 2012, Dr Joseph has been working as a consultation liaison psychiatrist at the Goulburn Valley Hospital (GVH). He has been conducting a psycho-oncology clinic in liaison with the oncology department of GVH since 2017. This is the first such clinic in rural Victoria, run by local mental health service and the oncology department.

As part of his keen interest in psycho-oncology, Dr Joseph visited Memorial Sloan Kettering Cancer Centre (MSKCC), New York, USA in 2018 and completed a one-month clinical observership in psycho-oncology. Dr Joseph trained in Meaning Centred Psychotherapy at MSKCC, New York and has been practising the same in advanced cancer patients.

Dr Joseph is an accredited member of the Faculty of Consultation Liaison Psychiatry of Royal Australian and New Zealand College of Psychiatrist and an Honorary Fellow of Melbourne University. He is a member of Clinical Oncology Society of Australia (COSA). He has published papers in peer reviewed journals.