 Katz was awarded the Gold Medal of the American Psychological Association, the Lewin Award of the Society for the Psychological Study of Social Issues, the Award of the American Association for Public Opinion Research, the Award of the American Association for Public Opinion Research, and was elected to the American Academy of Arts and Sciences.Katz produced classic studies of racial stereotyping and prejudice, and attitude change, and his pursuit of the connections between individual psychology and social systems helped to found the field of organizational psychology.An important methodological contribution was his open system theory, presented in "The Social Psychology of Organizations" (1966, later revised), which was co-authored by Robert L. Kahn.