 Wallach is a member of the International Law of War Association, which is a "loose confederation of military lawyers, academics, and government officials including members of the judiciary, who are interested in the advancement of a legal regime to ameliorate suffering and for the regulation of the use of armed force in armed conflicts".He is also a member of the American Law Institute and the Council on Foreign Relations.On June 27, 1995, President Clinton nominated Wallach to serve as a United States Judge of the United States Court of International Trade, to the seat vacated by Judge Edward D. Re.