Professor Tony Crook is a chartered town planner, Emeritus Professor of Town & Regional Planning and former Pro Vice Chancellor of the University of Sheffield. His current research focuses on planning obligations and affordable housing and on the supply side of the private rented housing sector. His co-authored book with Professor Peter A Kemp, Transforming Private Landlords was published by Wiley Blackwell in 2011. He is also actively engaged in policy and practice. He is chair emeritus of the Shelter Trustee Board, Deputy Chair of the Orbit Housing Group, a non executive director of a regional house-builder, a Trustee of the Coalfields Regeneration Trust, a council member of the Academy of Social Sciences, and a member of the Royal Town Planning Institute Trustee Board. He is a Fellow of the Academy of Social Sciences and was appointed CBE in 2014 for his services to housing and the governance of charities. Professor John Henneberry is a charted town planner, a chartered surveyor and Professor of Property Development Studies in Department of Urban Studies and Planning at the University of Sheffield. His research focuses on the structure and behaviour of the property market and its relation to the wider economy and state regulatory systems. He has particular interests in property development and investment and their contribution to urban and regional development. He has developed a distinctive 'old' institutional approach to property research that focuses on the impact of social, cultural and behavioural influences on market actors, structures, processes and outcomes. He is a Fellow of the Academy of Social Sciences. Professor Christine Whitehead is Emeritus Professor of Housing Economics at the London School of Economics and was for twenty years Director of the Cambridge Centre of Housing and Planning Research at the University of Cambridge. She is an internationally respected applied economist working mainly in the fields of housing economics, finance and policy. Major themes in her recent research have included analysis of the relationship between planning and housing; the role of private renting in European housing systems; financing social housing in the UK and Europe; and more broadly the application of economic concepts and techniques to questions of public resource allocation with respect to housing, education, policing and urban regeneration. Her latest book, with Kath Scanlon and Melissa Fernandez, Social Housing in Europe, was published by Wiley Blackwell in July 2014. She is a Fellow of the Academy of Social Sciences and was appointed OBE in 1991 for services to housing.