Prof William Ledger is Head of Discipline of Obstetrics and Gynaecology, at the University of New South Wales, Director of Reproductive Medicine and 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, was a member of the NHMRC Working Party to review national guidelines on ethics and ART and Chair of the MBS Working Party on costs of ART. His interests focus on in vitro fertilisation and assisted reproduction, reproductive ageing, endometriosis, premature ovarian failure and polycystic ovary syndrome, along with onco-fertility and health economic aspects of infertility.