1. Ulf Büntgen is Head of the Dendroecology Group at the Swiss Federal Research Institute wsl, as well as an Associated Research Fellow at the Oeschger Centre for Climate Change Research, University of Bern, and at the Global Change Research Centre AS CR, Brno. He is the lead author of “Filling the Eastern European Gap in Millennium-Long Temperature Reconstructions,” Proceedings of the National Academy of Science, CX (2012), 1773–1778, and of “2500 Years of European Climate Variability and Human...
2. Lena Hellmann is a doctoral student, Oeschger Centre for Climate Change Research, University of Bern. She is the lead author of “Tracing the Origin of Arctic Driftwood,” Journal of Geophysical Research, B, CXVIII (2013), 68–76.