Sarah Teo is a Research Fellow with the Regional Security Architecture Programme at the S. Rajaratnam School of International Studies (RSIS), Nanyang Technological University (NTU), Singapore. Her research interests include multilateral security and defense cooperation in ASEAN and the Asia Pacific, middle powers in the Asia Pacific, as well as IR theory. She is the co-author, with Ralf Emmers, of Security Strategies of Middle Powers in the Asia Pacific (Melbourne University Publishing, 2018) and co-editor, with Bhubhindar Singh, of minilateralism in the Indo-Pacific: The Quadrilateral Security Dialogue, Lancang-Mekong Cooperation Mechanism, and ASEAN (Routledge, 2020). Her articles have also been published in peer-reviewed journals including The Pacific Review, International Relations of the Asia-Pacific, and Australian Journal of International Affairs, as well as platforms such as East Asia Forum, Channel NewsAsia, and PacNet. From 2012 to 2015, she was a delegate to the Track II Network of ASEAN Defence and Security Institutions (NADI). She has a PhD from the University of Sydney, an MSc (International Relations) from RSIS, and a Bachelor of Communication Studies (Honours) from NTU.