Robert C.R. Siekmann studied Slavonic languages and law at the University of Leiden. His PhD (1988) at the University of Amsterdam dealt with the legal status of troop-contributing countries to UN peace-keeping operations. At the T.M.C. Asser Institute for International and European Law in The Hague he was Head of Research and then became Director of the newly established ASSER International Sports Law Centre.
In 2002 he launched The International Sports Law Journal (ISLJ) as its editor-in-chief and he was the editor-in-chief of the newly established ASSER International Sports Law Series of book publications. In June 2012 he retired from the Asser Institute, now a Professor of International and European Sports Law at Erasmus University Rotterdam.