Private practice, Melbourne, Australia, 1956-1959. Senior lecturer law University Adelaide, Australia, 1959-1966, University Melbourne, 1959-1966. Visiting professor law University Alabama, 1966-1967, professor law, director Law Library., 1968-1970.
Associate professor law Monash University, Melbourne, 1967-1968. Professor, law library Northwestern University, Chicago, 1970-1972, Duke University, Durham, North Carolina, 1972-1975. Professor, director Legal Information Center Vanderbilt University, Nashville, from 1975.
Visiting professor Free University Berlin, 1975, University San Diego, 1987. Fulbright lecturer University Los Andes, 1986, 88. Editorial consultant William S. Hein & Company, Buffalo.
Consultant legal research and information.
Author numerous books including (with Michael Blake and Howard Hood) United States Legislation on Foreign Relations and International Commerce, 1789-1979, 5 vols., 1977, 78, 84 (American Society International Law certified merit 1979), (with B.A. Christensen) A Guide to North Carolina Legal Research, 1973, (with Adolf Sprudzs) A Guide to the United States Treaties in Force, annually since 1982, Soviet Law in English, 1987, UST Index Service., 1776-1988.
Contributor articles to professional publications. Editor books including: International Military Law and History Reprint Series, since 1972.
Member American Arbitration Association, American Association Advancement Slavic Studies, American Association Law Libraries, American Society International Law, Association American Law Schools, British Institute International and Comparative Law, International Association Law Libraries (president 1976-1983), Society Public Teachers Law (United Kingdom), Institute for International Legal Information (chairman, editor International Journal of Legal Information).