Madelyn R. Creedon

Madelyn R. Creedon

Madelyn Creedon has had a long career in U.S. government service, most recently as principal deputy administrator of the National Nuclear Security Administration (NNSA) within the Department of Energy, a position she held from 2014 to 2017. She served in the Pentagon as assistant secretary of defense for global strategic affairs from 2011 to 2014, overseeing policy development in the areas of missile defense, nuclear security, cybersecurity, and space. She served as counsel for the U.S. Senate Committee on Armed Services for many years, beginning in 1990; assignments and focus areas included the Subcommittee on Strategic Forces as well as threat reduction and nuclear nonproliferation. During that time, she also served as deputy administrator for defense programs at the NNSA, associate deputy secretary of energy, and general counsel for the Defense Base Closure and Realignment Commission. She started her career as a trial attorney at the Department of Energy.

Following retirement from federal service in 2017, Madelyn established Green Marble Group, LLC, a consulting company and currently serves on a number of advisory boards related to national security. She is also a research professor at the George Washington University Elliott School of International Affairs and a nonresident senior fellow at the Brookings Institution.

She holds a Juris Doctor from St. Louis University School of Law, and a bachelor’s from the University of Evansville.

Congressional Commission on the Strategic Posture of the United States, chairman
Department of Energy, Secretary of Energy Advisory Board, vice chair
Nuclear Security Working Group, chair
Nuclear Security Working Group Fellowship program, chair

  • Areas of Expertise

    • Missile defense
    • Nuclear nonproliferation
    • Nuclear security
  • Current Positions

    • President, Green Marble Group LLC
    • Research Professor (part-time), Elliot School of International Affairs, George Washington University
  • Past Positions

    • Principal Deputy Administrator, National Nuclear Security Administration, United States Department of Energy (2014-2017)
    • Assistant Secretary of Defense for Global Strategic Affairs, United States Department of Defense (2011-2014)
    • Counsel/Lead Staff, Subcommittee on Strategic Forces, United States Senate Committee on Armed Services (1997-2000; 2001-2011)
    • Deputy Administrator for Defense Programs, National Nuclear Security Administration, United States Department of Energy (2000-2001)
    • Associate Deputy Secretary of Energy, United States Department of Energy (1995-1997)
    • General Counsel, Base Realignment and Closure Commission (1994-1995)
    • Professional Staff Subcommittee on Strategic Forces and Armed Services Committee Counsel, United States Senate Committee on Armed Services (1990-1995)
    • Trial Attorney and Acting Assistant General Counsel for Special Litigation, United States Department of Energy (1980-1990)
  • Education

    • J.D., St. Louis University School of Law
    • B.A., University of Evansville
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