Dr Gordon "Oz" Osinski is the NSERC/MDA/CSA Industrial Research Chair in Planetary Geology in the Departments of Earth Sciences and Physics and Astronomy at Western University, Canada. He holds a B.Sc. (Hons) First Class in Geology from the University of St. Andrews, Scotland (1999) and a Ph.D., also in Geology (2004), from the University of New Brunswick, Canada. His research covers the tectonics of impact crater formation, the generation of impact melts, emplacement of ejecta, and post-impact processes such as impact-associated hydrothermal activity. He has published more than 70 papers in peer-reviewed journals and special papers and has given over 60 conference presentations since 2001. Dr Elisabetta Pierazzo, who tragically died during the preparation of this book, was a Research Scientist at the Planetary Science Institute and an Adjunct Assistant Research Scientist at the Lunar & Planetary Laboratory, University of Arizona, both located in Tucson, Arizona. She held a Laurea in Physics from the University of Padua, Italy (1988) and a Ph.D. in Planetary Sciences from University of Arizona (1997). She was a world renowned expert on the numerical modelling of impact events, focusing on the environmental effects of impact events, oblique impacts, and impact melt production.