She was admitted to the District of Columbia Bar in 1980 and began her law career as an associate with the Washington, D.C. firm of Wald, Harkrader & Ross. In 1981, she became an attorney-adviser to Clarence Thomas who was then the Assistant Secretary of the U.S. Department of Education's Office for Civil Rights. When Thomas became Chairman of the U.S. Equal Employment Opportunity Commission (EEOC) in 1982, Hill went along to serve as his assistant, leaving the job in 1983.