Calvin Coolidge Hernton (1932-2001) was an American sociologist, poet, and author, particularly renowned for his 1965 study Sex and Racism in America, and for co-founding the society of Umbra.Calvin Coolidge Hernton (1932-2001) was an American sociologist, poet, and author, particularly renowned for his 1965 study Sex and Racism in America, and for co-founding the society of Umbra.