Dan Cziczo is Professor in the Department of Earth, Atmospheric and Planetary Sciences (EAPS) and the School of Aeronautics and Astronautics at Purdue University. He is an atmospheric scientist interested in the interrelationship of particulate matter and cloud formation. His research utilizes laboratory and field studies to elucidate how small particles interact with water vapor to form droplets and ice crystals which are important players in the Earth’s climate system.