one of the founders of the Sudbury Valley School (Sudbury School), has published several books on the Sudbury model of school organization, and has been described by Sudbury Valley School trustee Peter Gray as the "principal philosopher" among its founders. He is a former physics professor at Columbia University, and is described by Lois Holzman as the school's "chief 'philosophical writer'". http://en.wikipedia.org/wiki/Daniel_Greenberg_(educator)
co-author: Turning Learning Right Side Up
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