Published and presented widely on borders, biometrics, surveillance and security. Provided expert testimony to Canadian parliamentary committees, and been an invited speaker and research contributor to NATO, the World Customs Organization (WCO), INTERPOL, the European Science Foundation, and a various stakeholder groups involved in borders, security and mobility. Dr. Muller has been a visiting scholar in residence at the University of Victoria, the University of Arizona, Western Washington University, and Bilkent University in Ankara, Turkey, and currently teaches Critical Security Studies and International Political Sociology at King's University College at Western University, in London, ON, Canada.