Euphemia Lofton Haynes was the first Black woman to get a Ph.D. in mathematics, in 1943, and an important leader in the Washington, D.C. school system. She founded and headed the math department at Miner Teachers College, which trained black teachers. Haynes taught at many D.C. schools, always speaking out and working to help poor students and get better schools, protesting de facto segregationist policies. Haynes also did a great deal of work for the Catholic Church, particularly in social welfare, and was awarded a special papal medal. She also served as the president of the District of Columbia Board of Education, and used her position to fight segregation. She had a very long and influential career, a trailblazer and a tireless advocate for good, equal, desegregated schools.

Source: http://www.biography.com/people/euphemia-lofton-haynes-21465777#later-years-and-legacy