Affiliation: Universidad Nacional Autónoma de México, Instituto de Geología, Departamento de Ciencias Ambientales y Suelos.

Paul Szejner received his MS in Forest Ecology from Georg-August-Universität Göttingen and a PhD in Natural Resources from the University of Arizona in 2018. He is currently, tenure track research scientist at the Geology Institute from the Universidad Nacional Autónoma de Mexico, UNAM. His research focuses on the interpretation of Carbon and Oxygen stable isotopes in tree rings, plants, atmosphere, and water. He uses these observations as a tool to understand plant physiological response to environmental change in regional-to-global sales and form seasonal to multi-century time frames.