He was earlier a member (1999-2012) and chairman (2006-2012) of the Executive Board of the European Association of Tax Law Professors, a member (2003-2015) of the Supervisory Board of the Max Planck Institute for Tax Law and Public Finance in Munich, Germany and a member (1988-2019) of the IBFD Board of Trustees / Advisory Council. Kees van Raad has published widely on international tax law issues in general and tax treaties in particular and has taught at many foreign universities.