Professor of Educational Psychology, University of Illinois, 1950-1966.

    Lecturer in Psychology, Long Island University, 1948-1949.

    Lecturer in Psychology, Graduate School, Yeshiva University, 1948-1950.

    Visiting Professor of Psychology, Hochschule der Bundeswehr, Munich, West Germany, January-June 1980. Gast Professor of Psychology, University of Berne, Switzerland, 1977.

    Visiting Professor, Salesian University of Rome, 1964-1965.

    Visiting Professor of Psychology, Victoria University of Wellington, New Zealand, 1958-1958.

    Visiting Professor of Educational Psychology, University of Wisconsin, 1962.

    Visiting Professor of Psychiatry, University of Missouri, Medical School, March 1966.

    Fulbright Research Scholar (and Visiting Professor of Psychology),Victoria University of Wellington, New Zealand, 1957-1958.

    Editorial Board, Child Development, 1963-1964; and Monographs of Society for Research in Child Development, 1964-1965.

    Editorial Board, International Journal of the Addictions, 1963-present. Editorial Board, Journal of Special Education, 1968-present.

    Medical Advisory Board, Federal Bureau of Narcotics, 1958-1966.

    Fellow, American Psychological Association, 1954 (Divisions 7, 8, 12, 15). Consultant, United States Office of Education, 1968-1970.

    Board of Directors, Sex Information and Education Council of the United States (SIECUS), 1966-1969.

    Consultant, National Academy of Sciences (for Social Science Education in Agriculture), 1968.

    The Society of Sigma Xi, 1950.

    Consultant, Biological Sciences Curriculum Study, 1965.

    Consultant, Institute for the Study of Drug Addiction, 1963.

    Consultant, Maori Education Board, 1960-1970.