Anthony Philpotts is a visiting fellow at Yale University and an adjunct professor at the University of Massachusetts, and has had over 40 years of teaching experience. He has worked on Precambrian massif type anorthosites, pseudotachylites, alkaline rocks, liquid immiscibility in Fe-Ti oxide systems and in tholeiitic magmas. He has been awarded the Peacock Memorial Prize of the Walker Mineralogical Club of Toronto and the Hawley Award of the Mineralogical Association of Canada. He has served as an editor for the Canadian Mineralogist and the Journal of the Canadian Institute of Mining and Metallurgy. Jay Ague is a Professor at Yale University and has been teaching for 20 years. He studies fluid flow, chemical reactions, mass transfer, and heat transfer in Earth's crust, focusing on the metamorphic and igneous rocks comprising the deep roots of mountain belts. He has been the Senior Editor of the American Journal of Science from 1998 to 2008, and has served on the editorial board of the journal Geology. He is also Curator of Mineralogy at the Yale Peabody Museum of Natural History.