Madelyn Creedon served as the principal deputy administrator of the National Nuclear Security Administration (NNSA) within DOE from 2014 until 2017.
Prior to her appointment with NNSA, Madelyn 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 beginning in 1990. She has also served as deputy administrator for Defense Programs at the NNSA, associate deputy secretary for DOE, 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, Creedon established Green Marble Group, LLC, a consulting company. She 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.
Creedon holds a JD from St. Louis University School of Law, and a BA in political science and government from the University of Evansville.