Dr. Martens is a sought-after arbitrator in the international sports community. He is a Member of the Court of Arbitration for Sport, Lausanne, Switzerland and, in 2002, participated in the resolution of 15 disputes before the Court of Arbitration for Sport, often serving as President of the Panel. Dr. Martens has been counsel to the International Basketball Federation for more than 20 years and was Ad-hoc arbitrator for the 2000 Olympic Summer Games in Sydney and the 2002 Olympic Winter Games in Salt Lake City.

Dr. Martens studied at the Universities of Paris and Munich and received his Doctor of Laws from the University of Hamburg.  He is a Member of the International Bar Association, German-American Lawyers Association, and the American Arbitration Association. Dr. Martens speaks German, English, French, Spanish, and Italian.