Daniel A. Greenberg (28 September 1934 – 2 December 2021), was one of the founders of the Sudbury Valley School, has published several books on the Sudbury model of school organization,[1] and was described by Sudbury Valley School trustee Peter Gray as the "principal philosopher" among its founders.
[2] He was a physics professor at Columbia University, and was described by Lois Holzman as the school's "chief 'philosophical writer'".
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