Mary Lou Walker (born December 1, 1948) is an American lawyer who served as General Counsel of the Air Force during the presidency of George W. Bush. She gained notoriety for her role in a 2003 review by the United States Department of Defense of the so-called Torture Memos.
Mary L. Walker was born in Dayton, Ohio on December 1, 1948. She was educated at the University of California, Berkeley, receiving an A.B. in 1970. She then attended both UCLA Law School and Boston University School of Law, receiving a J.D. in 1973.
Walker joined the legal department of the Southern Pacific Transportation Company in 1973. She worked there until 1976, when she joined the law firm of Richards, Watson, Dreyfuss & Gershon in Los Angeles. She was made a partner in 1979, working there until 1982.
In 1982, Walker moved to the United States Department of Justice as Principal Deputy Assistant Attorney General in the Land and Natural Resources Division. From 1984 to 1985, she was the Deputy Solicitor of the United States Department of the Interior. On September 18, 1985, President of the United States Ronald Reagan nominated her to be Assistant Secretary of Energy (Environment, Safety, and Health). She subsequently held this office until 1988.
She spent 1988-89 as Vice President of Law Environmental Inc. She was a partner at Richards, Watson & Gershon in San Francisco from 1989 to 1991. She was a partner of Luce, Forward, Hamilton & Scripps in San Diego from 1991 to 1994, and then at Brobeck, Phleger & Harrison in San Diego from 1994 to 2001. She was also a U.S. Commissioner on the Inter-American Tropical Tuna Commission from 1988 to 1995. An evangelical Christian, she participated in the founding of the San Diego Professional Women's Fellowship, a group related to Campus Crusade for Christ.