Mr. Colby is co-founder and principal of The Marathon Initiative, a policy initiative focused on developing strategies to prepare the
United states for an era of sustained great power competition. He is the author of The Strategy of Denial: American Defense in an
Age of Great Power Conflict.
Previously, Mr. Colby was from 2018-2019 the Director of the Defense Program at the Center for a New American Security, where
he led the Center’s work on defense issues. Before that, he served as the Deputy Assistant Secretary of Defense for Strategy and
Force Development from 2017-2018. In that role, he served as the lead official in the development and rollout of the Department’s
2018 National Defense Strategy (NDS). The NDS shifted the Department of Defense’s focus to the challenges to U.S. military
superiority and interests posed by China and Russia. He also served as a primary Defense Department representative in the
development of the President’s 2017 National Security Strategy.
Mr. Colby was from 2014 to 2017 the Robert M. Gates Senior Fellow at the Center for New American Security. From 2010 to 2013
he was principal analyst and division lead for global strategic affairs at Center for Naval Analyses. Earlier in his career he served for
over five years in the U.S. Government working on a range of strategic forces, arms control, Weapons of Mass Destruction (WMD),
and intelligence reform matters, including service with the Coalition Provisional Authority in Iraq in 2003 and with the Office of the
Director of National Intelligence during its stand-up in 2005-2006. Mr. Colby has also served on the staff of several government
commissions, including the 2014 National Defense Panel, the 2008-2009 Strategic Posture Commission, and the 2004-2005
President’s WMD Commission.
Mr. Colby’s work has appeared in outlets such as Foreign Affairs, The Wall Street Journal, The Washington Post, The New York
Times, Foreign Policy, and The National Interest as well as in international outlets such as Asahi Shimbun, Yomiuri Shimbun, etc.
A member of the Council on Foreign Relations and the International Institute of Strategic Studies. Mr. Colby is a graduate of Harvard
College and Yale Law School.