Professor Haan is a clinical geneticist in the South Australian Clinical Genetics Service, a unit of SA Pathology based at Women’s and Children’s Hospital, and a Clinical Affiliate Professor in the Department of Paediatrics, University of Adelaide. He spends most of his professional time providing individuals and families with genetic diagnosis, counselling and testing. Academic interests include the genetics of intellectual disability, ethical issues associated with genetic testing and the causes and prevention of birth defects and cerebral palsy.