Tilly Alcayna is a global health and climate change expert with over a decade of experience in research, policy, and practice in humanitarian contexts. She is a Senior Technical Advisor on Health and Climate at the Red Cross Climate Centre, and has previously worked at Médecins Sans Frontières (MSF) and the Harvard Humanitarian Initiative (HHI), as well as a Policy Officer at the European Commission. She co-leads the global Anticipatory Action for Health working group hosted by the Anticipation Hub, and is completing a PhD at LSHTM on early warning systems for climate-sensitive infectious diseases.