Myles Horton, a founder of the Highlander Folk School, is called the Giant of the adult education movement in the United States. He aimed at the empowerment of the poor people in the South, which was called "the third world in America", because of its miserable situation. Horton's idea and practice in adult education for social change owes a lot to his days in the University of Chicago. He had learned sociology from Robert Park, and had visited the Hull-House to discuss with Jane Addams. Thus he established his own way of nonformal adult education, which lead to the idea of the Civil Rights Movement in the 1960s. This paper focuses upon his experience in Chicago around 1930. First, in order to make his Chicago days clear, it summarizes Horton's brief life history. Secondly, it attemps to describe his intellectual experience under the guidence of Robert Park: he took Park's collective behavior theory and conflict theory in his nonformal education practice. Thirdly, it focuses upon the intellectual interchange between Horton and Addams: In fact, the Highlander Folk School has some aspect of a settlement house. Lastly, it summarizes Horton's hope to make an alternative education system which supports people's decision making process. Thus, it depicts Horton's greatness as sociologist and adult education activist.