Helen Parkhurst (January 3, 1887 - June 1, 1973) was an American educator, author, lecturer, the originator of the Dalton Plan and the founder of The Dalton School. Born at Durand, Wisconsin, she was graduated from Wisconsin State Teachers College in 1907, studied at the universities of Rome and Munich as well as with Maria Montessori and was awarded her M.A. in 1943 from Yale University. Wikipedia
The definitive Wikipedia entry for Helen Parkhurst. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Helen_Parkhurst
This commission spread the Dalton ideas in Holland and in 1928 the first Dutch Girl's school, based on the principles of Helen Parkhurst, was founded. www.edith.nl/telmie2/reforped/theory/theory.html