Sarah Teo is an Assistant Professor and Coordinator of 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 defence 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 the 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 International Theory, The Pacific Review, International Relations of the Asia-Pacific, and Australian Journal of International Affairs, as well as in various op-ed and commentary platforms. She has a PhD from the University of Sydney, MSc (International Relations) from RSIS, and Bachelor of Communication Studies (Honours) from NTU.