The Little Red School House and Elisabeth Irwin High School, also referred to as LREI, is a school in Manhattan, New York City. It was founded by Elisabeth Irwin in 1921 as the Little Red School House and is one of the city's first progressive schools. 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.