Jarad Mason is the John L. Loeb Associate Professor of the Natural Sciences in the Department of Chemistry & Chemical Biology at Harvard University. He earned B.S. and M.S. degrees in Chemistry at the University of Pennsylvania, then obtained his Ph.D. in Chemistry from the University of California, Berkeley. Following graduate school, he was a postdoctoral fellow at Northwestern University before beginning his independent career at Harvard in 2018. His research group applies the tools of synthetic chemistry and nanoscience to design materials that address basic science challenges in energy and medicine, with a particular emphasis on the development of chemical strategies to manipulate entropic effects, phase transitions, and porosity. Recent research projects include efforts to design, synthesize, and study 1) liquids with permanent microporosity for aqueous-phase gas transport, 2) barocaloric materials for sustainable heating and cooling, 3) phase-change materials with switchable thermal conductivity, 4) network-forming glasses as optical phase-change materials, and 5) metal cluster-based solids with unique photophysical properties.