In practical development work, Leaf has served as Senior Social Scientist on the Irrigation and Water Management and Training Project, in India (1987–89), Senior Socio-Economist for the Bangladesh Flood Response Study (1990–93), and as a consultant to the United Nations Centre for Regional Development, Nagoya, Japan (1991–95).
He has served on the editorial board of Regional Development Dialogue, the journal of the United Nations Centre for Regional Development, and the online anthropological journal Mathematical Anthropology and Cultural Theory. He has held elected positions in the Culture and Agriculture section of the American Anthropological Association and the Society for Anthropological Sciences.
Contributions
Leaf's central concern is the social nature of thought and its relation to organization. Methodologically, his argument is for radical empiricism in opposition to positivism, Marxism, interpretivism, and postmodernism.
History of anthropological theory, in which he was the first writer to discuss the topic in terms of long-standing philosophical and epistemological conflicts. Previously, the convention had been to write as though the field developed simply as an accumulation of “discoveries.” Leaf described the conflict as between monism and dualism, with the former represented in modern philosophy and epistemology by Skepticism and Pragmatism, and the latter by the various forms of idealism and materialism—including positivism and Marxism. Although subsequent writers have emphasized different issues, explicit discussion of philosophical and epistemological assumptions has now become common. He was also the first modern writer to call attention to the roots of anthropological theory in legal theory.
General social theory, in which in the post-war period he was the second writer, after Fred Bailey, to explicitly repudiate the conception that the task of social analysis was to show the underlying unity of society or social structure. Leaf has argued consistently for organizational pluralism. In the sphere of culture, he has similarly argued that no community ever has a single unified system of ideas and values or “symbols and meanings,” at any level. There are always multiple, independent and often mutually opposed, cultural idea-systems. With Dwight Read, Michael Fischer, Douglas R. White, and others he has contributed to the development of methods for eliciting and describing such systems with previously unattained clarity and verifiability. These include the ideas that define kinship, religion, government, local organizations, and productive organizations. The theoretical effort includes developing a more general statement of Shannon and Weaver's A Mathematical Theory of Communication.
2004: "What is 'Formal' Analysis?", Cybernetics and Systems: An International Journal
2005: "The Message Is the Medium: Language, Culture and Informatics", Cybernetics and Systems: An International Journal
2005: "Romanticism, Meaning, and Science", Language, Culture and the Individual: A Tribute to Paul Friedrich, ed. Catherine O'Neil, Mary Scoggin, and Kevin Tuite
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