Mary Ellen Richmond (1861-1928) was an American social worker, teacher, and theoretician. She was general secretary of the Baltimore Charity Organization. In 1897 she delivered her historic speech at the National Conference of Charities and Correction calling for direct social work practice. She published Friendly Visiting Among the Poor in 1899 which was intended for those beginning to do charitable work in the homes of the poor. She became general secretary of the Philadelphia Society for Organizing Charity in 1900. She published her most celebrated book Social Diagnosis in 1917. Her other works include: The Good Neighbor in the Modem City (1907), What is Social Casework? An Introductory Description (1922) and The Long View: Papers and Addresses (1930).