Prof Booy is a Senior Honorary Professorial Fellow at University of Sydney having joined in March 2005. He has held a range of positions, including Professor of Child Health at the University of London, and Head of Clinical Research at the National Centre for Immunisation Research and Surveillance (NCIRS) at Westmead Children's Hospital. Prof Booy’s research interests extend from understanding the genetic basis of susceptibility to, and severity of, infectious diseases, especially influenza, and invasive disease caused by encapsulated organisms; the clinical, public health and social burden of these diseases; and means by which to prevent or control serious infections through vaccines, drugs and non-pharmaceutical measures.