An interview with Prof. Martin de Jong of Delft University of Technology on ‘Institutional Transplantation’. Prof. de Jong is one of the ‘founding fathers’ of the policy transfer school in public policy. The book he has co-edited in 2002 and entitled “The Theory and Practice of Institutional Transplantation” has become a classic in this area. In this interview Martin tells us about his work, hopes and challenges with regard to cross-national learning and movement of policies and ideas.