Charles Horton Cooley (August 17, 1864 – May 7, 1929) was an American sociologist and the son of Michigan Supreme Court Judge Thomas M. Cooley. He studied and went on to teach economics and sociology at the University of Michigan, was a founding member of the American Sociological Association in 1905 and became its eighth president in 1918. He is perhaps best known for his concept of the looking-glass self, which is the concept that a person's self grows out of society's interpersonal interactions and the perceptions of others. Cooley's health began to deteriorate in 1928. He was diagnosed with an unidentified form of cancer in March 1929 and died two months later.