JUDITH TREAS is Chancellor's Professor of Sociology and Director of the Center for Demographic and Social Analysis at the University of California, Irvine. Her previous book, edited with Sonja Drobnič, is Dividing the Domestic: Men, Women and Household Work in Cross-National Perspective (2010). JACQUELINE SCOTT is Professor of Empirical Sociology in the Faculty of Human, Social and Political Sciences, University of Cambridge and a Fellow of Queens' College. Her recent edited books include Gendered Lives: Gender Inequalities in Production and Reproduction (with Shirley Dex and Anke Plagnol, 2012); Gender Inequalities in the 21st Century: New Barriers and Continuing Constraints (with Rosemary Crompton and Clare Lyonette, 2010); and Women and Employment: Changing Lives and New Challenges (with Shirley Dex and Heather Joshi, 2009). MARTIN RICHARDS is Emeritus Professor of Family Research, Centre for Family Research, University of Cambridge. His recent books include Reproductive Donation: Practice, Policy and Bioethics (edited with Guido Pennings and John B. Appleby, 2012), and We Are Family? Relatedness in Assisted Reproduction: Families, Origins and Identities (edited with Tabitha Freeman, Fatemeh Ebtehaj, and Susanna Graham, 2014).