Jan Esper

Jan Esper (born 1968) studied geography at the University of Bonn, where he later earned his doctorate. After a postdoc position at Columbia University in New York City, he continued his work on dendrochronology at the Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), and qualified as a professor at the University of Bern. In 2018, Esper became a member of the Academy of Sciences and Literature. Since 2010, he has been a professor at the Department of Geography at Johannes Gutenberg University Mainz.¹

Esper's research focuses on global climate change, paleoclimate, urban climate and dendrochronology. In 2020, he received the European Research Council (ERC) Advanced Grant to improve climate reconstructions from tree rings.² His research has notably included hockey stick graph temperature reconstructions.³⁴⁵

• Juckes, M.N.; Allen, M.R.; Briffa, Keith R.; Esper, Jan; Hegerl, G.C.; Moberg, Anders; Osborn, Timothy J.; Weber, S.L.; Zorita, Eduardo (2006). "Millennial temperature reconstruction intercomparison and evaluation". Climate of the Past Discussions. 2 (5): 1001–1049. doi:10.5194/cpd-2-1001-2006.
• Esper, Jan; Wilson, Robert J.S.; Frank, David C.; Moberg, Anders; Wanner, Heinz; Luterbacher, Jürg (2005). "Climate: past ranges and future changes" (PDF). Quaternary Science Reviews. 24 (20–21): 2164–2166. Bibcode:2005QSRv...24.2164E. doi:10.1016/j.quascirev.2005.07.001. Archived from the original (PDF) on 2006-12-30.
• Esper, Jan; Cook, Edward R.; Schweingruber, Fritz H. (2002). "Low-frequency signals in long tree-ring chronologies and the reconstruction of past temperature variability" (PDF). Science. 295 (5563): 2250–2253. Bibcode:2002Sci...295.2250E. doi:10.1126/science.1066208. PMID 11910106. S2CID 22184321. Archived from the original (PDF) on 2007-02-21.
• Esper, Jan; Frank, David C..; Wilson, Robert J.S. (2004). "Climate Reconstructions: Low-Frequency Ambition and High-Frequency Ratification". EOS. 85 (12): 113–120. Bibcode:2004EOSTr..85..113E. doi:10.1029/2004EO120002.