Early landmarks in social psychiatry included: Karen Horney, MD, who wrote about personality as it interacts with other people (1937); Erik Erikson, who discussed the influence of society on development (1950); Harry Stack Sullivan's (1953) integration of sociological and psychodynamic concepts, and his work on the role of early interpersonal interactions in the development of the self; Cornell University's Midtown Manhattan Study, which looked at the prevalence of mental illness in Manhattan; August Hollingshead, PhD, and Frederick Redlich, MD, looked at the influence of social class on psychiatric conditions (1958); Alexander H. Leighton, MD, looked at the relationship between social disintegration and mental illness (1959); Burrow was an early pioneer of the social causes of mental disorder and suggested "Sociatry" as the name for this new discipline.