Since 2000, he has researched, taught and published in transgender health, as well as worked with transgender clients. He worked for 30 years at the University of Hong Kong, and now heads up a sexology team in the School of Public Health at Curtin University in Perth. He has worked with a number of UN agencies (including UNDP, WHO, UNAIDS and UNESCO), as well as with community organisations working on health issues for transgender people.