Judith L. Bronstein is University Distinguished Professor of Ecology and Evolutionary Biology, with a joint appointment in the Department of Entomology, at the University of Arizona. Dr. Bronstein’s lab focuses on the ecology and evolution of interspecific interactions, particularly on mutually beneficial ones (mutualisms). Her career-long goal has been to build a solid conceptual foundation for the study of these poorly understood interactions. Using a combination of field observations, experiments, and theory, the Bronstein lab is examining how population processes, abiotic conditions, and the community context determine net effects of interactions for each participant species. Specific conceptual areas of interest include: (i) conflicts of interest between mutualists and their consequences for the maintenance of beneficial outcomes; (ii) the causes and consequences of "cheating" within mutualism; (iii) context-dependent outcomes in both mutualisms and antagonisms; and (iv) anthropogenic threats to mutualisms. With colleagues, she is extending these concepts to explore business and educational “ecosystems. She has served in leadership positions at the University of Arizona, the Arizona-Sonora Desert Museum, and the National Science Foundation. Dr. Bronstein has been Editor-in-Chief of The American Naturalist, a leading international journal in ecology and evolution, and is a Fellow of the Ecological Society of America. She is President-Elect of the American Society of Naturalists.