Thomas W. Swetnam (born 1955) is Regents' Professor Emeritus of Dendrochronology at the University of Arizona, studying disturbances of forest ecosystems across temporal and spatial scales.
Swetnam received his bachelor's degree in biology and chemistry from the University of New Mexico and subsequently received his master's and PhD from the University of Arizona in watershed management and dendrochronology.
He received the Harold C. Fritts Lifetime Achievement Award from the Tree-Ring Society in 2016.
He received the Harold Biswell Award for Lifetime Achievement from the Association for Fire Ecology in 2016.
He has served on the following advisory and editorial boards: Board of trustees, Valles Caldera National Preserve (2000-2004); Arizona Forest Health Advisory Council (2003-2006); Arizona Climate Change Advisory Group (2005-2006); associate editor, International Journal of Wildland Fire, (1993–present); editor, Tree-Ring Research (2000-2001); associate editor, Ecoscience (1994-1998); associate editor, Canadian Journal of Forest Research (1998); editorial board, Ecological Applications (1998-1999); associate editor, Dendrochronlogia, (2005–2012); board of trustees, The Nature Conservancy, New Mexico, 2016–2019.