This edited collection is part of a two-part special edition on Migration and Ageing. This first part reflects a collaboration between the Migration and Ageing Populations Centre (MAP) and the Centre for Migration, Policy and Society (COMPAS) both based at the University of Oxford. It considers the provision of care for older people by migrant eldercare workers in the United Kingdom, the Republic of Ireland, Canada and the United States and draws on research funded by the Nuffield Foundation and Atlantic Philanthropies. The second volume: Eastern EuropeMigration and Ageing, will appear as Volume 4 in 2011 and will reflect research undertaken by the MILES3 collaborative research network. These two special volumes represent a new multi-disciplinary collaboration whereby demographers interested in population ageing and migration as one response to this demographic trend, have worked closely with colleagues from migration studies who have realised the necessity of understanding population ageing as a context to their work.