Born in
Mishawaka, Indiana, Barker received a
Bachelor of Science degree from
Indiana University Bloomington in 1965 and a
Juris Doctor from
American University Washington College of Law in 1969. She was a legislative assistant for
United States Representative Gilbert Gude in 1969 and for
United States Senator Charles H. Percy from 1969 to 1971. She was a special counsel to the
United States Senate Government Operations Committee, permanent Subcommittee on Investigations in
Washington, D.C. from 1971 to 1972. She was a director of research and director of scheduling and advance to Senator Percy's re-election campaign in 1972. She then served as an
Assistant United States Attorney in the Southern District of Indiana from 1972 to 1976, and as a First Assistant United States Attorney from 1976 to 1977. She was in private practice in
Indianapolis, Indiana from 1977 to 1981. She was the United States Attorney for the Southern District of Indiana from 1981 to 1984. In 2012, Barker received the
Benjamin Harrison Presidential Site Advancing American Democracy Award. ==Federal judicial service==