Diana Hadley is a founding member and president of the Northern Jaguar Project (NJP), a binational non-profit based in Arizona dedicated to preserving the northernmost breeding population of jaguars on the continent. She is an environmental historian who retired from the Arizona State Museum at the University of Arizona as associate curator of ethnohistory. She has published articles and government reports on ecological changes in the U.S. Mexico borderlands. The former operator of a cattle ranch on the US/Mexico border, her interest in the resolution of livestock wildlife conflicts led her to involvement in jaguar conservation. Currently, she assists NJP with program management of the 55,000-acre Northern Jaguar Reserve and several nearby cattle ranches, in order to provide a safe-haven for jaguars and other wildlife species in this remarkably biodiverse portion of the foothills of the Sierra Madres, only 120 miles south of the international boundary.