Tom Erik Arnkil, Ph.D., is a research professor at Stakes (Research and Development Centre for Welfare and Health, Helsinki, Finland) and an associate professor of social policy at the University of Helsinki. For two decades he and his team have studied "multi-problem" - or "multi-agency" - situations where multiple helpers may get stuck, and sought to develop means for enhancing co-operation between professionals and with the clients and their personal networks. Arnkil has authored and co-authored numerous articles and seventeen books.