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In the 1950s, Rambusch, having trained as a Montessori teacher in London and opened a Montessori school in Connecticut, became the AMI representative in the United States. Following that, she founded the AMS and became its first president.
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Interest in Montessori education began to grow, spurred by the publication of this article and others like it over the next several years.
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The publication of Rambusch's book further energizes public interest in Montessori education, leading to the opening of new Montessori programs.
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Cleo Monson became the executive secretary for AMS, a position she held for ten years, before becoming the organization's first executive director in 1973.
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Annual conferences and symposia have been held (regionally, nationally and internationally) from the first conference held in 1963, in Chicago, Ill.
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AMS consultants visited affiliated schools and observed classes and environment, offering feedback and suggestions for improvement. AMS also developed standards for teacher training and certification.
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The first International Symposium, held in Athens, Greece, was a great success.
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MACTE accredits Montessori teacher education programs with the aim of improving the quality of such programs, and assuring the public of their quality.
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Originally founded by AMS in 2012, NCMPS became an independent organization in 2015. Its mission is to grow and support Montessori education in public schools.
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AMS and AMI/USA joined together to work on public policy issues, combining forces to provide a unified voice in advocacy and public policy.