John Henry Haaren (1855-1916) was an American educator and historian. John Haaren studied under Prof. N. M. Butler at Columbia University, 1889-91, before becoming a teacher in New York. In 1907 he became Associate Superintendent of Schools in New York, increasing the number and efficiency of kindergartens and starting classes to teach English to foreigners. Haaren was president of the department of pedagogy in the Brooklyn Institute. Haaren High School (which was located on 10th Avenue between 58th and 59th Streets in Manhattan) was named in his honor. The Charles B. J. Snyder-designed school which was initially DeWitt Clinton High School is now Haaren Hall on the campus of the John Jay College of Criminal Justice. Haaren wrote a several history books which are still appreciated today, of which this is one.