Dr. Hill completed post graduate training in paediatric medicine at the Royal Children's Hospital in 1970; further training at that Institution was undertaken as a Research Fellow in Thoracic Medicine. Since 1983 he has been the Director of the Department of Allergy, Royal Children's Hospital, developing these clinically based research projects on allergic diseases of childhood. He is also an author of more than 100 scientific papers on allergic diseases of children.

In 1995, Dr. Hill was appointed as Secretary General of the Trans Pacific Allergy & Immunology Society (TPAIS) and then became Vice President in 1997. During 1997 he joined an expert panel of advisers to the Food and Agriculture Organisation of the United Nations .

on issues relating to food allergy and in 2001 was a Consultant to the FAO/WHO Expert Consultation on Foods Derived from Biotechnology

During 1996, Dr. Hill became a member of the Panel of Technical Advisers at Workshops - IPCS/WHO (Norway) on chemical exposure and food allergy and in 1998 he was appointed Member of the Asia-Pacific Basin Region of the American Academy of Asthma, Allergy and Immunology and in 1999 to the Executive of the Asia Pacific Association of Pediatric Allergy, Respirology and Immunology (APAPARI).

From 2002-2004 Dr. Hill was Chairman of the Asia-Pacific Basin Region Committee of the American Academy of Asthma, Allergy and Immunology (AAAAI) and from 2003 Co-Chairman of the International Committee of the AAAAI. From 2003 he has been the Australian Representative of the Early Prevention of Asthma in Atopic Children study (EPAAC) and in 2006 he was appointed to the Educational Committee of the World Allergy Organization.

Dr. Hill retired as Director of the Department of Allergy in 2006 to take up a research position in Food Allergy in the Murdoch Children's Research Institute at the Royal Children's Hospital, Melbourne