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1926
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Members of the Threefold Group purchase property on Hungry Hollow Road and start Threefold Farm.
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1929-1933
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Major renovations are undertaken to make the property into a working conference center. The original farmhouse (today known as Main House) is made into a guesthouse and restaurant, and the original cow byre (today known as Brookside) is converted into a lecture hall.
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1933
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The first Anthroposophical Summer Conference is held in July. Except for the World War II years, summer conferences have been held every year since 1933.
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1946-1961
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Ehrenfried Pfeiffer lives and works at Threefold, teaching, consulting and conducting research in agriculture and food quality.
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1948
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First year of the Kindergarten that eventually evolves into Green Meadow Waldorf School.
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1949
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Threefold Auditorium is dedicated.
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1950's
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Construction of a studio for the painter Richard Kroth; that building today houses Eurythmy Spring Valley.
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1956
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Green Meadow Waldorf School opens its first building (today’s Kindergarten), and inaugurates elementary education.
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1965
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The Threefold Educational Foundation and School is chartered, and various property holdings and legal entities are consolidated under its umbrella.
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1966-1974
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Continued Green Meadow expansion: Construction of the Lower School in 1966, the Gym in 1970, the Arts Building in 1973, and the High School in 1974.
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1966
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The Rudolf Steiner Fellowship Foundation, a community-based retirement facility, is chartered by the New York State Department of Social Welfare.
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1970
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An international youth conference, "Self Development and Social Responsibility," draws 600 participants from throughout the U.S. and Europe.
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1972
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Lisa Monges begins a training in Eurythmy later to become Eurythmy Spring Valley.
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1973
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The Hungry Hollow Co-op begins operations as a natural foods buyers’ club from the basement of a Green Meadow teacher’s house.
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1980
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Dorothea Mier arrives to re-found Eurythmy Spring Valley.
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1986
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The Waldorf Institute relocates to Threefold and is renamed Sunbridge College.
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1986
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The Village of Chestnut Ridge is incorporated.
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1990-2000
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Ongoing work to upgrade properties and bring them into compliance with new zoning regulations.
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1991
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Sunbridge College is authorized to grant the Master of Science degree.
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