Dr. Ranalda Tsosie is a Diné (Navajo) environmental chemist and assistant professor in the
Department of Earth and Environmental Science at New Mexico Institute of Mining and
Technology, where she also directs the Environmental Science program. Raised on the Navajo
Reservation and later trained in the Pacific Northwest, she brings together Indigenous
knowledge, analytical chemistry, and geoscience to address environmental challenges affecting
tribal and rural communities in the Southwest.

Her research examines contaminants in water, soil, and ecosystems, with a focus on emerging
pollutants and their impacts on Native lands. She specializes in community-engaged and
culturally grounded research approaches that center reciprocity, relational accountability, and
Indigenous Research methodologies. Her work is shaped by her lived experiences growing up
without electricity or running water and by the teachings of her family and community.

Dr. Tsosie earned her Ph.D. in Interdisciplinary Studies from the University of Montana, with
emphases in Chemistry, Geosciences, and Environmental Studies. She holds a B.S. in Chemistry
with a minor in Navajo Linguistics from the University of New Mexico and an A.S. from Diné
College, where her scientific training was first rooted in Diné ways of knowing.