This book on mobility of health professionals reviews, analyses and summarises published information and data as well as collected interview data from stake holders, including politicians, policy makers, health service managers and migrant health workers. It is based on the research carried out under the umbrella of the EU- funded project "Mobility of Health Professionals" (MoHProf). The partners involved in the MoHProf project gathered evidence from 25 countries around basic questions and knowledge gaps relating to the international migration of health professionals, which involved an analysis of migration flows and evaluation of policies addressing migration. This book provides a comprehensive description and analysis of the mobility streams, the motives and driving forces behind them and the impact on and challenges for health systems and draws conclusions and provides recommendations for future strategic planning, monitoring and the management of mobility of health professionals as well as further research and policy development needs.