He is the international security contributor to the NPR news program “Hear and Now,” and his comments and analysis have appeared in the New York Times, New York review of books, Washington Post, Wall Street Journal, ABC, CBS, NBC, Fox, and numerous other national and international media outlets. His recent publications include “Laser Enrichment and the Proliferation of Nuclear Weapons” and “Stopping North Korea, Inc.: Sanctions Effectiveness and Unintended Consequences.”

Before coming to MIT, Dr. Walsh was Executive Director of the Managing the Atom project at Harvard University’s Kennedy School of Government and a visiting scholar at the Center for Global Security Research at Lawrence Livermore National Laboratory.