Marco G. Malusà is a geologist at the University of Milano-Bicocca whose main research emphasis is the tectonic evolution and exhumation processes of orogenic belts and associated detrital fluxes to sedimentary basins. He obtained his MSc and PhD degrees at the University of Torino, and began his research career contributing to extensive geologic mapping projects in the Western Alps with the National Research Council of Italy. His research integrates bedrock and detrital thermochronology with field geology (sedimentology, stratigraphy, structural geology) and geophysics. Study areas include orogenic belts and sedimentary basins of the Mediterranean and North Africa. Paul G. Fitzgerald is a Professor of Earth Sciences at Syracuse University in New York. He obtained his BSc and BSc(Hons) degrees at Victoria University of Wellington in New Zealand and his PhD at the University of Melbourne in Australia. He was a post-doctoral researcher at Arizona State University and then a research scientist at the University of Arizona. His research involves the application of low-temperature thermochronology to geologic and tectonic problems, mainly associated with the formation of orogens and understanding geologic processes. He has worked extensively in Antarctica, Alaska, the Basin and Range Province of southwestern United States, Papua New Guinea and the Pyrenees.