Recht der Vereinigten Staaten
Bellinger is a member of the Council on Foreign Relations, the American Law Institute, the American Council on Germany, and the British-American Project. He is also member of the Secretary State's Advisory Committee on International Law. In 2012, he was appointed to the Defense Legal Policy Board. In October 2012, the American Law Institute named him as a Counselor for the Restatement Fourth of the Foreign Relations Law of the United States.