Joseph has worked in full time private practice since completing a Bachelor of Arts Honours Degree in Psychology in 1987 and obtaining registration with the South Australian Psychological Board in 1990. From 1992 Joseph has provided both clinical and organisational psychological services to SA Ambulance Service. He is a full member of the Australian Psychological Society and a member of the College of Clinical and College of Organisational Psychology, with AHPRA endorsement in clinical and organisational psychology practice. In 2006 Joseph completed a PhD, University of South Australia. In June 2011 Joseph was appointed as a Member of the Order of Australia (AM) for services to community health through the provision of psychological intervention and support programs and support to personnel in the emergency services.

Joseph has practiced in clinical and organisational psychology for the past twenty five years, with a specific interest in anxiety and mood disorders, in addition to individual coaching and team development, with a specific interest in psychological evaluation and recruitment. Clinical intervention and expertise is centred on a Cognitive and Behavioural Therapy (CBT) and Acceptance and Commitment Therapy (ACT) framework.

Over the past 20 year Joseph has provided EAP service to both public and private sector organisations in addition to evaluating the effectiveness of work place based intervention programs. Joseph's work in organisations has also included developing and delivering various training programs focusing on organisational development and building and maintaining healthy work places. Joseph is a Fellow of the College of Clinical Psychologists and a Fellow of the College of Organisational Psychologists.