James Trefil is the Clarence J. Robinson Professor of Physics at George Mason University. He has made contributions to research in elementary particle physics, fluid mechanics, medical physics (including cancer research), and the earth sciences and has written extensively about science for the general audience. He has recently completed a term as General Councilor of the American Physical Society and was awarded the prestigious Gemant Prize of the American Institute of Physics for his efforts to present science to the general public.

Robert M. Hazen is the Clarence J. Robinson Professor of Earth Science at George Mason University and Staff Scientist at the Carnegie Institution of Washington Geophysical Laboratory. He performs research on materials at high pressure and is studying the hypothesis that life arose in a deep, high-pressure environment. He is the author of more than 230 articles and 16 books on science, history, and music. A Fellow of the American Association for the Advancement of Science, he has received numerous awards for his science writing.