Dr Penelope Law is a consultant obstetrician and gynaecologist at the Hillingdon Hospital, London, honorary senior lecturer at Imperial College, London, and consultant obstetrician and gynaecologist at the Portland Hospital. Dr Law has wide experience of pregnancy and birth in public and private hospitals. The Australian editions of 'Expecting a Baby?' and 'Expecting Twins?' have been co-edited by Dr Sarah Clements, an obstetrician and maternal-fetal medicine specialist at the Prince of Wales Private Hospital and the Royal Hospital for Women in Sydney.