1855-1936. German social theorist and philosopher, one of the founders of the sociological tradition of community studies and urban sociology through his key work, Gemeinschaft-Gesellschaft 1887. Tonnies contrasted the nature of social relationships in traditional societies and small organizations (Gemeinschaft, `community') with those in industrial societies and large organizations (Gesellschaft, `association'). He was pessimistic about the effect of industrialization and urbanization on the social and moral order, seeing them as a threat to traditional society's sense of community.