The Little Red School House and Elisabeth Irwin High School, also referred to as LREI, was founded by Elisabeth Irwin in 1921 in Manhattan, New York City as the Little Red School House, and is regarded as the city's first progressive school. Created as a joint public-private educational experiment, the school tested principles of progressive education that had been advocated since the turn of the 20th century by John Dewey. The founders postulated that the lessons of progressive education could be applied successfully in the crowded, ethnically diverse public schools of the nation's largest city.