Andrés Valenzuela-Sánchez is a veterinarian and PhD, co-founder and President of ONG Ranita de Darwin. He is currently a Research Fellow in Wildlife Health at ZSL's Institute of Zoology, where he also serves as Deputy Director for the MSc programmes in Wild Animal Biology and Wild Animal Health, jointly delivered by the Royal Veterinary College and ZSL. Andrés has published in high-impact journals including Science, Nature Ecology & Evolution, Ecology Letters, Proceedings B, Journal of Animal Ecology, and Journal of Applied Ecology, on topics spanning disease ecology, population ecology, and amphibian conservation. As part of his conservation work, Andrés chairs the Governance Committee of the Binational Conservation Strategy for Darwin's frogs and co-chairs the Communications and Education Working Group of the IUCN Amphibian Specialist Group.