Johannes Müller is an environmental historian specializing in environmental change and its human perceptions as well as the history of knowledge and science. He is an assistant professor at the Leiden University Centre for the Arts in Society and a guest researcher at the Naturalis Biodiversity Center. He currently leads and participates in several interdisciplinary research projects that focus on the history of biodiversity and environmental change in the Netherlands and its former colonies. Beyond his academic work, he has long experience in fish breeding and actively participates in various local biodiversity initiatives.