Prof William Ledger is Head of Discipline of Obstetrics and Gynaecology at the University of New South Wales, the director of reproductive medicine and a senior staff specialist at the Royal Hospital for Women, and a fertility specialist at City Fertility in Sydney. He is chair of the RANZCOG Research Assessment Committee, a former member of the NHMRC Working Party reviewing national guidelines on ethics and ART, and chair of the MBS Working Party on ART costs. His research interests include in vitro fertilisation, assisted reproduction, reproductive ageing, endometriosis, premature ovarian failure, polycystic ovary syndrome, onco-fertility, and the health economics of infertility.