Long interested in issues surrounding NATO, Fox and his wife Annette Baker Fox published "NATO and the Range of American Choice" in 1967, which analyzed the range of reactions to the evolution of NATO and the American role within it. Fox also worked on behalf of the Arms Control and Disarmament Agency, addressing issues related to the security of Western Europe. In a 1967 address to the one of the World Affairs Councils of America, Fox said that NATO "seems superfluous because it is working ... it is in part a victim of its own success."