Professional Service
Member, Board of Editors: Ecological Applications (2004-  )
Subject Editor: Oikos (2006-  )

Referee: American Naturalist, Annales Zoologici Fennici, Bioscience, Canadian Entomologist, Canadian Journal of Botany, Canadian Journal of Forest Research, Climatic Change, Ecography, Ecology, Ecology Letters, Ecological Entomology, Ecological Modeling, Ecoscience, Environmental and Experimental Botany, Environmental Entomology, European Journal of Entomology, Field Crops Research, Forest Science, Functional Ecology, Global Change Biology, Journal of Applied Ecology, Journal of Biogeography, Journal of Geophysical Research - Biogeosciences, Journal of Economic Entomology, Journal of Insect Behavior, Journal of Tropical Ecology, Integrated Pest Management Reviews, Landscape Ecology, Mycologia, New Phytologist, Oecologia, Oikos, Proceedings of the National Academy of Sciences, Proceedings of the Royal Society B, Science, Southern Journal of Applied Forestry, Southwestern Naturalist, Symbiosis, Tree Physiology

Panel member: National Science Foundation

Ad hoc reviewer: NSF, USDA NRICGP, NASA, Italian Science Foundation, Czech Science Foundation, U.S. Civilian Research & Development Foundation (CRDF), National Geographic Society, Canadian Foundation for Climate and Atmospheric Sciences, Norwegian Centres of Excellence, Earthwatch, Swiss National Science Foundation

External Reviewer, European Union Project: Biodiversity and Climate Change, A Risk Analysis (BACCARA)
Member, Expert Panel on Adaptation of Forests to Climate Change, IUFRO / United Nations, 2008-2010
Contributor, Workshop on Climate change and Agricultural Trade, sponsored by STDF and World Bank Research Group.  Resulting briefing note.
Invited contributor to National Assessment of Climate Change

Research Group Member
Ecology and epidemiology of forest pests and pathogens, Southern Research Station, Pineville, Lousiana (Brian T. Sullivan et al.);

Forest pests and global change, Universidad de Santiago, Spain. Maria J. Lombardero et al.

European wood wasp (Sirex noctilio), USDA APHIS; Maria Lombardero, Universidad de Santiago, Spain; Dan Gruner and Brian Thompson, University of Maryland; Forestry and Agricultural Biotechnology Institute, University of Pretoria, South Africa (Michael J. Wingfield, Jeffrey R. Garnas).

Plant-herbivore interactions and climate change, University of Joensuu, Finland (Pekka Niemelä and Heikki Roininen et al.)

Climate change ecology, Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden (Christer Bjorkman et al.).

Beech-bark disease, Paul Smith College, New York (Celia Evans).  Northern Research Station, Burlington, VT (Mark Twery).  Dave Houston (USFS, retired)