Charles Horton Cooley was an American sociologist associated with the University of Michigan in the early 20th century. He was a founding member of the American Sociological Association and is best known for developing the concept of the "looking-glass self", which describes how individuals perceive themselves based on how they believe others view them. The looking-glass self involves three steps - imagining how one appears to others, imagining others' judgments, and developing feelings like pride or shame based on that imagined judgment. Cooley made important contributions to the concepts of self, socialization, and primary groups in sociological theory.