A.S. Neill was a Scottish educator and writer, best known for founding the progressive school Summerhill in 1921. He believed in the importance of freedom in education, advocating for a child-centered approach that allowed students to learn at their own pace and pursue their interests. Neill's philosophy emphasized the emotional well-being of children, arguing that happiness should be a primary goal of education. Neill authored several books, including Summerhill: A Radical Approach to Child Rearing, which outlines his educational principles and experiences. His ideas have influenced alternative education movements and continue to spark discussions about the role of freedom and structure in learning environments.