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A past (elected) member of the Society for Psychical Research and the National Investigations Committee on Aerial Phenomena (from 1960), he has won "UFOlogist of the Year Award" of the National UFO Conference twice (1972 and 1992).
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Greenfield was elected and consecrated a Bishop by the Holy Synod of the Neopythagorean Gnostic Church in 1986.
Advisors included Hans Dieter Betz, André Caquot (1923–2004), Jonas C. Greenfield (1926–1995), Erik Hornung Professor of Egyptology at Basel University, Michael E. Stone of the Hebrew University of Jerusalem, and Manfred Weipert of the University of Heidelberg.
In the wake of Leiby Kletzky, New York City Councilman David Greenfield has said he would propose “Leiby’s Law,” a bill under which businesses could volunteer to be designated as safe places for children who are lost or otherwise in trouble.
Greenfield argued against the positivist orientation of the so-called Theory Movement in educational administration and proposed a subjectivist approach to the study of educational administration.
Another notable contributor is New York City Councilman David G. Greenfield, Esq., formerly executive vice president of the Sephardic Community Federation and director and counsel of TEACH NYS who was featured in the Inside Politics feature.