Daniel works in the Faculty of Medicine, Nursing and Health Sciences at Monash University as a Professor.

Professor O'Connor is Head of the Aged Mental Health Research Unit based at Kingston Centre. He has published over 80 papers and chapters on epidemiology, the recognition and manage of dementia and depression in general medical practice, non-pharmacological treatments of behaviour disorders in dementia, and service evaluation. Major topics of interest at present concern ECT as a treatment of severe late-life depression and nursing home psychiatry. He teaches undergraduate and postgraduate students, supervises doctoral students, lectures widely in Victoria and interstate, and is chair of the Royal Australian and New Zealand College of Psychiatrists Faculty of Psychiatry of Old Age. He is now head of the Dementia Collaborative Research Centre - Assessment and Better Care node concerning behavioural and psychological symptoms of dementia.

Dementia; Behavioural and psychological symptoms of dementia; Residential care; Non-pharmacological and psychosocial interventions for dementia; Assistive technology