Mary L. Oehrlein, FAIA, earned a bachelor of architecture from Iowa State University and joined the Historic American Buildings Survey as a staff architect in 1972. She worked as an architectural conservator for Universal Restoration, Inc., before becoming vice president of Building Conservation Technology, a subsidiary of The Ehrenkrantz Group in 1975. She worked as director and senior associate of The Ehrenkrantz Group's Washington, D.C., office from 1978 to 1983 and formed her own practice, Oehrlein & Associates Architects, in 1984. Her practice focused on historic preservation and technical restoration services for historic buildings and structures, including the Tomb of the Unknowns, the Washington Monument, Mount Vernon, and the Pentagon following its damage in September 2011. She joined the staff of the Architect of the Capitol in 2011 as its historic preservation officer. Oehrlein is a founder of the Washington Architectural Forum and a co-founder of the Washington, D.C., chapter of the Association for Preservation Technology. She was the president of the Washington, D.C., chapter of the American Institute of Architects and has served as a board member of the Virginia State Review Board for Historic Landmarks, the D.C. Preservation League, and the Washington Architectural Foundation.