Patricia Lewis is research director, international security at Chatham House, UK. Her area of expertise includes international security/relations/treaties, defense policy, science and technology policies, weapons of mass destruction (nuclear, chemical and biological) and conventional armaments, as well as arms control, non-proliferation and disarmament. She conducts projects in the area of cyber security, nuclear non-proliferation and disarmament, biosecurity, conventional arms trade and space security. Since 2012, Dr. Lewis is a member of the International Advisory Board, The Centre for Nuclear Non-proliferation and Disarmament. In previous positions, she has been deputy director and scientist-in-residence at the James Martin Center for Nonproliferation Studies, Monterey Institute of International Studies, Middlebury College, USA, and Director, United Nations Institute for Disarmament Research (UNIDIR), Geneva, Switzerland.