Mark Fitzpatrick is Executive Director of the Americas office of the International Institute for Strategic Studies and head of the IISS Non-Proliferation and Nuclear Policy Programme. 

He is the author of "Asia’s Latent Nuclear Powers: Japan, South Korea and Taiwan, Overcoming Pakistan’s Nuclear Dangers", and "The Iranian Nuclear Crisis: Avoiding worst-case outcomes" and the editor of six books on countries and regions of proliferation concern.

He has lectured throughout the world and is a frequent media commentator. He is a co-founder of the EU Non-Proliferation Consortium. He joined IISS in October 2005 after a 26-year career in the US Department of State, including as Deputy Assistant Secretary for Non-Proliferation (acting).