Fox often spent time abroad as a scholar, including in England in 1955, as a Fulbright Lecturer at the Rio Branco Institute and Pontifical Catholic University of Rio de Janeiro in Brazil in 1966, in Mexico in 1967, and as a visiting research fellow at Australian National University in 1968 and 1979. In addition, he was a visiting professor at Carleton University in Ottawa in 1971, as well as the Claude T. Bissell Visiting Professor of Canadian-American Relations at the University of Toronto for 1982–83. He saw Canada as an ideal vehicle for studying what was similar and different compared to the U.S. in foreign policy, and in 1985 he published the book "A Continent Apart: The United States and Canada in World Politics". He served as a consultant to the U.S. Department of State for a number of years, as well as to other governmental agencies, and lectured at the National War College and various service branch colleges.