Tim Nguyen is the Head of Unit for High Impact Events in the Epidemic and Pandemic Preparedness and Prevention Department of the WHO Health Emergencies Programme (WHE). His unit develops innovative approaches to community co-creation and decision-making tools. Joining WHO in 2006 working as a Technical Officer in the Yellow Fever Programme which coordinated an initiative funded by the GAVI Alliance to provide 40 million doses of vaccine to most at risk populations. In 2008, he joined WHO’s Global Influenza Programme and took part in the global response work to the first influenza pandemic of the 21st century. From 2014-2017, he was the Unit leader for Knowledge Management, Evidence and Research for Policy-Making at the WHO Regional Office for Europe based in Copenhagen, Denmark. There, he established the scientific journal Public Health Panorama and developed the WHO/Europe resolution and action plan for evidence-informed policy-making. Tim is responsible to govern the strategic medical countermeasure reserves for pandemic influenza vaccines, as well as the WHO smallpox vaccine stockpile. His team is further responsible for the newly established WHO BioHub mechanism which allows for the sharing of biological materials with epidemic and pandemic potential for the development of future countermeasures. During the 2022 multi-country outbreak of mpox, he was responsible to assess the availability, access options to and allocation of mpox vaccines and antivirals. During his time as the Head of secretariat of the International Coordination Group for the provision of emergency vaccine (ICG), over 50 million doses of vaccines were shipped to over 60 country requests responding to outbreak control. Currently, he leads WHO’s work on the interim coordination mechanism for medical countermeasures (i-MCM-Net). The objective of i-MCM-Net is to strengthen the global MCM ecosystem’s resilience, preparedness and responsiveness to pandemic threats by creating a measure of convergence and enhance communication, collaboration and coordination between existing key MCM networks, actors and constituencies at global and regional levels. To realize meet objective, the mechanism aims to facilitate alignment of partner efforts and resources, leverage collective expertise and catalyze joint action.