Jonathan Fortney is a Professor at the University of California, Santa Cruz. He is an expert in the atmospheres and interiors of planets in the solar system and exoplanets around other stars. He is a former member of NASA's Cassini Mission science team, which transformed our understanding of Saturn, as well as a member of NASA's Kepler Mission science team, which found over 3000 exoplanets. Fortney predominantly works on pioneering theoretical models of the physics and chemistry of planets.