Paul R. Weissman is a Senior Research Scientist at JPL, specializing in comets. He is the author of over 100 scientific papers and 30 popular articles. He is also the co-author, with Alan Harris, of a children’s book on the Voyager mission. Dr. Weissman received his doctorate in planetary and space physics from the University of California, Los Angeles. His work includes both theoretical and observational studies of comets, investigating their orbital motion, their physical make-up, and the threat they pose due to possible impacts on the Earth. Dr. Weissman is an Interdisciplinary Scientist on ESA’s Rosetta mission to comet Churyumov-Gerasimenko.