Mary Anne rejoined Hogan & Hartson in 2001 after serving as General Counsel of the U.S. Department of Energy (DOE) from 1998 to 2001 and as Deputy General Counsel for environment and nuclear programs from 1994 to 1998. During her government service, she provided advice and counsel to the DOE on electricity restructuring, the California electricity crisis, oil and gas policy, environmental compliance, global climate change, clean coal programs, the Northeast heating oil shortage, radioactive waste disposal, nuclear safety regulation, workforce restructuring, whistleblowers, and privatization of uranium enrichment activities. Mary Anne provided extensive legal support for the opening of the world's first deep geologic disposal facility for radioactive waste, and negotiated the first agreements with electric utilities regarding voluntary reductions of greenhouse gas emissions. She provided active legal oversight of one of the government's largest intellectual property programs, and a multibillion dollar government contracting program. She was a participant on the attorney general's task force on alternative dispute resolution. Before entering government service, Mary Anne was a member of Hogan & Hartson's energy group from 1977 through 1993. She represented oil, gas, coal, and electricity interests principally before the DOE, U.S. Department of the Interior, U.S. Department of Treasury, and the Federal Energy Regulatory Commission in related litigation. She also provided advice and counsel on environmental issues to the chemical, electronics, and automotive industries. Mary Anne is a frequent public speaker and is the author of numerous articles on a variety of energy and environmental law topics. She has testified before several congressional committees on nuclear safety regulation, whistleblowers, environmental management, and other issues. She was a senior lecturer in law at Duke University Law School during the spring 2004 semester, and she was a professorial lecturer in law at George Washington University Law School for the fall 2006 semester, teaching energy law.