The Dalton School, originally the Children's University School, is a private, coeducational college preparatory school in New York City and a member of both the Ivy Preparatory School League and the New York Interschool. The school is located in four buildings within the Upper East Side of Manhattan. In November 2021, it was announced that José Manuel De Jesús would replace Interim Head of School Ellen Stein as Head in July 2022. Former Head of School Jim Best resigned in April 2021 after 16 years at the school. History The Dalton School, originally called the Children's University School, was founded by Helen Parkhurst in 1919. Parkhurst's "Dalton Plan", to which the school still adheres, reflected the Progressive Education movement that had begun in the late 19th century. After experimentation in her own one-room school with Maria Montessori, Helen Parkhurst visited other progressive schools in Europe including Bedales School and its founder and headmaster John Haden Badley in England. She developed what she termed the Dalton Plan, which called for teachers and students to work together toward individualized goals. The Laboratory Plan was first put into effect as an experiment in the high school of Dalton, Massachusetts, in 1916. The estate of her benefactor Josephine Porter Boardman, was also near the town of Dalton and from this beginning the Laboratory Plan and school eventually took their names. In 1919, Helen Parkhurst relocated to New York City, where she opened her first school on West 74th Street. Larger facilities soon became necessary; the Lower School was moved to West 72nd Street, and the High School opened in the autumn of 1929 in the current building at 108 East 89th Street. Eleanor Roosevelt admired the work of Helen Parkhurst and played an important role in expanding the population and resources of the school by promoting a merger between the Todhunter School for girls (founded by Winifred Todhunter) and Dalton in 1939. Enlarged and modified through the years, Dalton still celebrates many of the school-wide traditions begun by Helen Parkhurst, including the Candlelighting Ceremony (the last day before winter break), Greek Festival (performed by sixth graders), and Arch Day (the last day of school). Academically, the school still subscribes to the Dalton Plan, which Parkhurst helped to create. Over the years, the Dalton Plan has been adopted by schools around the world, including schools in Australia, Austria, Belgium, Chile, the Czech Republic, England, Korea,