He spoke early and often against segregation and for education. He received nearly thirty honorary doctorates and other honors and awards including election to the Schomburg Honor Roll of Race Relations, one of a dozen major leaders so honored. He had been a model for one of his Morehouse students, Martin Luther King, Jr., and he served the young minister as an unofficial senior advisor. He gave the eulogy at King's funeral. Among his books were the first sociological study of African-American religion, The Negro's Church, published in 1933; and The Negro's God, of 1938; Disturbed About Man, of 1969; and his autobiography Born to Rebel, of 1971. These books reveal a combination of sharp intellect with religious commitment and prophetic conviction.
The American National Biography website has a comprehensive biography on Dr. Mays.