Vanderlip founded the Scarborough School, the first Montessori school in the U.S.[
Montessori education had spread to the United States by 1912 and became widely known in educational and popular publications. In 1913 Narcissa Cox Vanderlip and Frank A. Vanderlip founded the Scarborough School, the first Montessori school in the U.S.[12][13] However, conflict arose between Montessori and the American educational establishment. The 1914 critical booklet The Montessori System Examined by influential education teacher William Heard Kilpatrick limited the spread of Montessori's ideas, and they languished after 1914. Montessori education returned to the United States in 1960 and has since spread to thousands of schools there. Montessori continued to extend her work during her lifetime, developing a comprehensive model of psychological development from birth to age 24, as well as educational approaches for children ages 0 to 3, 3 to 6, and 6 to 12.[14]