Roel Snieder holds the Keck Foundation Endowed Chair of Basic Exploration Science at the Colorado School of Mines. From 1997 to 2000, he served as Dean of the Faculty of Earth Sciences at the University of Utrecht. Snieder has served on the editorial boards of Geophysical Journal International, Inverse Problems, Reviews of Geophysics, and the European Journal of Physics. In 2000, he was elected Fellow of the American Geophysical Union. He is co-author of the textbook The Art of Being a Scientist: A Guide for Graduate Students and their Mentors (Cambridge University Press, 2009). From 2003 to 2011, he was a member of the Earth Science Council of the US Department of Energy. In 2008, Snieder worked for the Global Climate and Energy Project at Stanford University on outreach and education on global energy. That same year, he was a founding member of the humanitarian organization Geoscientists Without Borders, where he served as chair until 2013. In 2011, he was elected Honorary Member of the Society of Exploration Geophysicists. Kasper van Wijk is an Associate Professor in the Physics Department and Director of the Physical Acoustics Laboratory at the University of Auckland. He studied geophysics at the University of Utrecht from 1991 to 1996, where he specialized in inverse theory. After teaching outdoor education in the mountains of Colorado, Van Wijk obtained his PhD in geophysics from the Colorado School of Mines and taught at Boise State University. His research interests center around elastic-wave propagation in disordered media, with applications ranging from medical imaging to global seismology. Van Wijk has (co-)organized and taught geophysical field camps in Colorado, Oregon, and Thailand. His worldwide outreach efforts, as part of Seismometers in Schools, have exposed diverse audiences to the dynamic processes of our Earth.