1. Michael McCormick is Francis Goelet Professor of Medieval History, Harvard University. He is the author of Origins of the European Economy: Communications and Commerce, a.d. 300–900 (New York, 2002); “History's Changing Climate: Climate Science, Genomics, and the Emerging Consilient Approach to Interdisciplinary History,” Journal of Interdisciplinary History, XLII (2011), 251–273.
2. Ulf Büntgen is Scientific Researcher, Swiss Federal Research Institute wsl and the occr, University of Bern. He is the author of, with H. Kauserud and S. Egli, “Linking Mushroom Productivity and Phenology to Climate Variability,” Frontiers in Ecology and the Environment, X (2012), 14–19.
3. Mark A. Cane is G. Unger Vetlesen Professor of Earth and Climate Sciences and Director, Master of Arts Program in Climate and Society, Lamont-Doherty Earth Observatory, Columbia University. He is the author of, with S. Hsiang et al., “Civil Conflicts Are Associated with the Global Climate,” Nature, 476 (2011), 438–441.
4. Edward R. Cook is Ewing Lamont Research Professor, Lamont-Doherty Earth Observatory, Columbia University. He is the author of, with R. Seager et al., “Megadroughts in North America: Placing IPCC Projections of Hydroclimatic Change In A Long-Term Paleoclimate Context,” Journal of Quaternary Science, XXV (2010), 48–61.
5. Kyle Harper is Assistant Professor of Classics and Letters, University of Oklahoma, Norman. He is the author of Slavery in the Late Roman World, AD 275–425 (New York, 2011).
6. Peter Huybers is Professor of Earth and Planetary Sciences, Harvard University. He is the author of, with Cristian Proistosescu and Adam C. Maloof, “To Tune or Not to Tune: Detecting Orbital Variability in Oligo-Miocene Climate Records,” Earth and Planetary Science Letters,” 325/326 (2012), 100–107.
7. Thomas Litt is Professor of Palaeobotany, University of Bonn. He is the author of, with C. Schölzel et al., “Vegetation and Climate History in the Westeifel Volcanic Field (Germany) during the Last 11,000 Years Based on Annually Laminated Lacustrine Sediments,” Boreas, XXXVIII (2009), 679–690.
8. Sturt W. Manning is Goldwin Smith Professor of Classical Archaeology and Director of the Malcolm and Carolyn Wiener Laboratory for Aegean and Near Eastern Dendrochronology, Cornell Tree Ring Laboratory, Cornell University. He is the author of, with Andrew Manning et al., The Late Roman Church at Maroni Petrera: Survey and Salvage Excavations 1990–1997, and Other Traces of Roman Remains in the Lower Maroni Valley, Cyprus (Nicosia, 2002).
9. Paul Andrew Mayewski is Professor and Director, Climate Change Institute, University of Maine. He is the author of, with M. C. Morrison, Journey into Climate: Exploration, Adventure and the Unmasking of Human Innocence (Santa Fe, 2011).
10. Alexander F. M. More is a Ph.D. candidate, Department of History, Harvard University. He is the author of “Civic Medicine” and “Averroës,” in Robert E. Bjork (ed.), Oxford Dictionary of the Middle Ages (New York, 2008).
11. Kurt Nicolussi is Associate Professor, Institute of Geography, Innsbruck University. He is the author of, with Ulf Büntgen et al., “2500 Years of European Climate Variability and Human Susceptibility,” Science, CCCXXXI (2011), 578–582.
12. Willy Tegel is Researcher, Institute for Forest Growth, University of Freiburg. He is the author of, with Ulf Büntgen et al., “2500 Years of European Climate Variability and Human Susceptibility,” Science, CCCXXXI (2011), 578–582.