John S. Roden passed away unexpectedly in an accident while kayaking on the Thompson River in British Columbia, Canada, on July 14, 2023. He was a young 63 years of age, born in Syracuse, New York, on October 8, 1959. Most of us knew John professionally as an ecophysiologist whose many contributions to tree-ring science helped shape how we interpret the climatic signals contained within hydrogen and oxygen isotope ratios of tree-ring cellulose. The mechanistic model of tree-ring stable isotopes that he developed several decades ago is still highly cited, and widely applied today (Roden et al. 2000).

John graduated from the University of Washington in 1987. He received his doctoral degree in 1992 with Dr. Robert Pearcy at the University of California, Davis on sunfleck ecophysiology and leaf flutter in Populus tremuloides (Roden and Pearcy 1993a,b). After graduating, he worked in Australia...

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