Souhegan Cooperative High School (/saʊˈhiːɡən/) is a Coalition of Essential Schools high school located in Amherst, New Hampshire, in the United States. Students from Amherst and Mont Vernon attend Souhegan for 9th through 12th grades. There are about 750 students. The school was founded based on the work of Theodore R. Sizer, a former dean of the Harvard Graduate School of Education, a notable American education reform leader and the father of the Essential Schools movement. Notably, Souhegan's progressive reputation has been chronicled in the book Standards of Mind and Heart: Creating the Good High School by Tony Wagner, Peggy Silvia and Dr. Robert A. Mackin (Teachers College Press, 2002). Based on this history, the school was founded with the mission "Souhegan High School aspires to be