He was recruited to the Howard University faculty by the school’s first African-American president, Mordecai Johnson. From 1929 to 1935, Houston served as Vice-Dean and Dean of the Howard University School of Law. He developed the school, beginning its years as a major national center for training black lawyers. He extended its part-time program to a full-time curriculum and gained accreditation by the Association of American Law Schools and the American Bar Association. Bringing prominent attorneys to the school as speakers and to build a law network for his students, Houston served as a mentor to a generation. He influenced nearly one-quarter of all the black lawyers in the United States at the time, including former student Thurgood Marshall, who became a United States Supreme Court justice. Houston believed that the law could be used to fight racial discrimination and encouraged his students to work for such social purpose.