Theodore Ryland Sizer was a leader of educational reform in the United States, the founder of the Essential school movement and was known for challenging longstanding practices and assumptions about the functioning of American secondary schools. Beginning in the late 1970s, he had worked with hundreds of high schools, studying the development and design of the American educational system, leading to his major work Horace's Compromise in 1984. In the same year, he founded the Coalition of Essential Schools based on the principles espoused in Horace's Compromise.
Sizer was born in New Haven, Connecticut to Theodore Sizer, an art history professor at Yale University. He received his B.A. in English from Yale in 1953 and subsequently served in the Army as an artillery officer. He later described his experience leading soldiers in a democratic and egalitarian fashion as a formative influence on his ideas about education. After teaching in high schools, he earned his masters and doctorate in education from Harvard University in 1957 and 1961, respectively. He was a faculty member and later dean of the Harvard Graduate School of Education, a position he held during the 1969 Harvard student strike. While dean, he reorganized the school into seven departments, expanding the resources available for research, while expanding minority enrollment.
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