In October 2011 Professor Wesselingh took up the position as the inaugural Executive Director of the South Australian Health and Medical Research Institute (SAHMRI).

Professor Wesselingh is Chair of the NHMRC Research Committee and Director NHMRC Council and President-elect of the Australian Academy of Health and Medical Sciences Limited (AAHMS).

Professor Wesselingh was Dean of the Faculty of Medicine, Nursing and Health Sciences at Monash University, from 2007-2011.  Prior to taking up the Deanship, he was Director of the Burnet Institute an independent medical research institute specialising in infectious diseases, immunology and public health.

Professor Wesselingh undertook his undergraduate and doctoral training at Flinders University/Flinders Medical Centre in South Australia and his post-doctoral training at Johns Hopkins in the United States.

Professor Wesselingh is an Infectious Diseases Physician and researcher in HIV, vaccine development and the impact of the microbiome on human health.

Professor Wesselingh has consistently worked towards the integration of high quality medical research with health-care delivery, leading to improved health outcomes for Australia and the poorly resourced countries of the region.