Andi Lloyd
Vice President for Academic Affairs & Dean of the Faculty
Middlebury College
Middlebury, VT 05753

Contact information

  • e-mail: lloyd@middlebury.edu
  • phone: 802-443-5735

Education

  • Ph.D., 1996. Department of Ecology and Evolutionary Biology, University of Arizona, Tucson.
  • M.S., 1993. Department of Biology and Wildlife, University of Alaska, Fairbanks.
  • B.A., cum laude, 1989. Department of Geography, Dartmouth College.

Employment

  • Vice President for Academic Affairs & Dean of the Faculty, Middlebury College, VT (2014-present)
  • Dean of the Faculty, Middlebury College, VT (2012-present)
  • Full Professor, Department of Biology, Middlebury College, VT (2009-present)
  • Associate Professor, Department of Biology, Middlebury College, Vermont (2003-2009)
  • Assistant Professor, Department of Biology, Middlebury College, Vermont (1996-2003)
  • Research Assistant, University of Arizona (1992-1996)
  • Teaching Assistant, University of Arizona (1995)
  • Teaching Assistant, University of Alaska (1990-1992)
  • Research Assistant, Dartmouth College (1989-1990)

 

Grants (since 1996)

  • NSF (DEB-1026415): “Regional consequences of changing climate-disturbance interactions for the resilience of Alaska’s boreal forest.” (subaward; 5 yrs, $100,000; 2010-2016)
  • NSF (ARC-0902088) : “Timing of warm season precipitation: key driver of  fire regime, tree species composition and tree growth?” (3 yrs, $143,937; 2009-2012)
  • NSF (ARC-0612346) : “Collaborative Research/RUI: Past, Present and Future Productivity of Arctic Woody Vegetation in a Warming Climate,” (3 yrs @ $167,386; 2006-2009)
  • NSF-LTER (2006-2010). The Dynamics of Change in Alaska’s Boreal Forests: Resilience andVulnerability in Response to Climate Warming, (4 yrs @ $78,000).
  • NSF-LTER (2004-2006). Resilience in Alaska boreal forests (renewal proposal for Bonanza Creek LTER) (2 yrs @ $40,000)
  • NSF-LTER (2001-2004). Interactions of multiple disturbances with climatein Alaska boreal forests (renewal proposal for Bonanza Creek LTER) (4 yrs @ $79,800)
  • NSF DUE (99-80911) “Developing an integrated curriculum in ecology at Middlebury College” (3 yrs @$42,592; 1998-2001)
  • NSF-OPP Supplement: “Developing a community outreach project on the Seward Peninsula, Alaska”.  (1 yr @ $14,640; 1998)
  • Vermont EPSCOR.  “Long-term forest dynamics in an uncut forest fragment in central Vermont.” (1 yr @ $6,599; 1998)
  • National Science Foundation (as part of Bonanza Creek LTER3 Renewal Proposal).  “Treeline dynamics at altitudinal and latitudinal treeline in Alaska.”  (2 yrs @ $15,000; 1998-1999)
  • U.S. Forest Service (via Bonanza Creek LTER).  “20th century treeline expansion in Alaska”.  (1 yr @ $10,000; 1998)
  • National Science Foundation Office of Polar Programs.  “Climate and the expansion of the boreal forest at latitudinal treeline: a field- and model- based investigation.” (3 yrs @ $183,563; 1998-2000)
  • Faculty Professional Development Fund, Middlebury College.  “Response of altitudinal treeline to 20th century warming in interior Alaska.”  (1 yr @ $1,250; 1997)
  • Faculty Professional Development Fund, Middlebury College.  Travel to Tucson, AZ for workshop on Global Change in the Sierra Nevada, CA.
  • Bonanza Creek Long-Term Ecological Research Site. “Controls over spruce establishment at altitudinal treeline in interior Alaska.” (1 yr @$4,000).

Awards

  • 1998: William S. Cooper Award from the Ecological Society of America for “an outstanding recent article on an aspect of geobotany or physiographic ecology”.  (Awarded for Lloyd & Graumlich 1997)
  • 1996: Hoshaw Award from the Department of Ecology & Evolutionary Biology, University of Arizona.
  • 1995: Edward S. Deevey award by the Paleoecological section of the Ecological Society of America for the best student paper at the Ecological Society Annual Meeting.

Publications

Miscellaneous publications:

Sturm, M., F.S. Chapin III, D.B. Griffith, M.E. Edwards, H.P. Huntington, G.P. Kofinas, A.H. Lloyd, A.H. Lynch, B.J. Peterson, R.A. Pielke Sr., J.P. Schimel, M.C. Serreze, and G.R. Shaver. PACTS (Pan-Arctic Cycles, Transitions and Sustainability): A Science Plan. Published by the Land-Atmosphere-Ice-Interactions Science Management Office, P.O. Box 757740, University of Alaska Fairbanks, Fairbanks, Alaska 99775-7740, January 2003.

Book chapters

Lloyd, A.H., P.F. Sullivan, and A.G. Bunn (2017)  Upper and Latitudinal Treelines.  In: M. Amoroso, P. Baker, J. J. Camaeror-Martinez, and L. Daniels, Editors.  Dendroecology: Tree-ring analyses applied to ecological studies.  Springer-Verlag, New York. DOI: 10.1007/978-3-319-61669-8

Lloyd, A. H., M. E. Edwards, B. P. Finney, J. Lynch, V. A. Barber, and N. Bigelow. (2006) Development of the boreal forest. Pages 62-78 in F. S. Chapin, III, M. Oswood, K. Van Cleve, L. Viereck, and D. Verbyla, editors. Alaska’s Changing Boreal Forest. Oxford University Press, Oxford.

Peer-reviewed articles

Nicklen, E.F., C. A. Roland, R.W. Ruess, J.H. Schmidt, and A.H. Lloyd.  2016.  Local site conditions drive climate-growth responses of Picea mariana and Picea glauca in interior Alaska.  Ecosphere.  DOI: 10.1002/ecs2.1507.

Wolken, J.M., D.H. Mann, T.A. Grant, A.H. Lloyd, T.S. Rupp, and T.N. Hollingsworth.  2016. Climate-Growth Relationships Along a Black Spruce Toposequence in Interior Alaska.  Arctic, Antarctic, and Alpine Research.  48(4): 637-652.  DOI:  http://dx.doi.org/10.1657/AAAR0015-056.

Lloyd, A.H., P.A. Duffy, D.H. Mann. 2013. Nonlinear responses of white spruce growth to climate variability in interior Alaska. Canadian Journal of Forest Research. 43: 331-343, doi: 10.1139/cjfr-2012-0372.

Berner, L.T., P.S.A. Beck, A.G. Bunn, A.H. Lloyd and S.J. Goetz.  2011.  High-latitude tree growth and satellite vegetation indices: correlations and trends in Russia and Canada (1982-2008).  Journal of Geophysical Research.  116:G01015, doi:10.1029/2010JG001475.

Goetz, S.J., H.E. Epstein, U.S. Bhatt, G.J. Jia, J.O. Kaplan, H. Lischke, Q. Yu, A. Bunn, A.H. Lloyd, D. Alcaraz-Segura, P.S.A. Beck, J.C. Comiso, M.K. Raynolds, D.A. Walker.  2011.  Recent changes in Arctic vegetation: satellite observations and simulation model predictions.  In: Gutman, G. and Reissell, A., Eds.  Eurasian Arctic Land Cover and Land Use in a Changing Climate.  Springer-Verlag, New York.

Lloyd, A.H., A. Bunn, and L. Berner.  2010.  A latitudinal gradient in tree growth response to climate warming in the Siberian taiga.  Global Change Biology.  doi:10.1111/j.1365-2486.2010.02360.x.

Chapin, F.S., A.D. McGuire, R.W. Ruess, T.N. Hollingsworth, M.C. Mac, J.F. Johnstone, E.S. Kasischke, E.S. Euskirchen, J. Jones, M. T. Jorgenson, K. Kielland, G.P. Kofinas, M.R. Turetsky, J. Yarie, A.H. Lloyd, D.L. Taylor.  2010.  Resilience of Alaska’s boreal forest to climatic change.  Canadian Journal of Forest Research.  40(7):1360-1370.

Hollingsworth, T.N., A.H. Lloyd, D.R. Nossov, R.W. Ruess, B. Charlton, K. Kielland.  2010.  Twenty-five years of change along a putative successional chronosequence on the Tanana River, Alaska.  Canadian Journal of Forest Research.  40(7):1273-1287.

McGuire, A.D., R.W. Ruess, A.H. Lloyd, J. Yarie, J.S. Clein, G.P. Juday. 2010.  Vulnerability of White Spruce Tree Growth in Interior Alaska in Response to Climate Variability: Dendrochronological, Demographic, and Experimental Perspectives Canadian Journal of Forest Research.  40(7):1197-1209.

Lloyd, A.H. and A.G. Bunn.  2007. Response of the circumpolar boreal forest to 20th century climate variability. Environmental Research Letters. 2 045013 (13pp)   doi:10.1088/1748-9326/2/4/045013.

Lloyd, A.H., C.L. Fastie, and H. Eisen.  2007.  Fire and substrate interact to control the northern range limit of black spruce (Picea mariana) in Alaska.  Canadian Journal of Forest Research.  37:2480-2493.

F. S. Chapin, III*, M. Sturm, M. C. Serreze, J. P. McFadden, J. R. Key, A. H. Lloyd, A.D. McGuire,  T. S. Rupp, A. H. Lynch, J. P. Schimel, J. Beringer, W. L. Chapman, H.E. Epstein, E. S. Euskirchen, L. D. Hinzman, G. Jia, C.-L. Ping, K. D. Tape, C. D. C.Thompson , D. A. Walker, and J. M. Welker.  2005. Role of Land-Surface Changes in Arctic Summer Warming.  Science. 310(5748):657-660.

Lloyd, A.H., A.E. Wilson, C. L. Fastie, R. M. Landis.  2005.  Population dynamics of black and white spruce in the southern Brooks Range, Alaska.  Canadian Journal of Forest Research. 35 (9): 2073-2081

Lloyd, A.H. 2005.  Ecological histories, ecological futures: what recent changes at treeline reveal about the future.  Ecology.  86(7):1687-1695

Hinzman, L., N. Bettez, F.S. Chapin, M. Dyurgerov, C. Fastie, B. Griffith, A. Hope, H.P. Huntington, A. Jensen, D. Kane, D.R. Klein, A. Lynch, A. Lloyd, A.D. McGuire, F. Nelson, W.C. Oechel, T. Osterkamp, C. Racine, V. Romanovsky, D. Stow, M. Sturm, C.E. Tweedie, G. Vourlitis, M. Walker, D. Walker, P.J. Webber, J. Welker, K. Winker and K. Yoshikawa. Evidence and implications of recent climate change in terrestrial regions of the Arctic. (2005). Climate Change. 72 (3): 251-298

Overpeck, J. et al.  2005.  Arctic system on Trajectory to New, Seasonally Ice-Free State.  EOS.  86: 309-316.Po

Epstein, H.E.,  J. Beringer, W.A. Gould, A.H. Lloyd, C.D. Thompson, F.S. Chapin III, G.J. Michaelson, C.L. Ping, T.S. Rupp, D.A. Walker. 2004.  The nature of spatial transitions in the Arctic.  Journal of Biogeography. 31:1917-1933.

Lloyd, A.H., K. Yoshikawa, C. L. Fastie, L. Hinzman, and M. Fraver.  (2003).  Effects of permafrost degradation on woody vegetation at arctic treeline on the Seward Peninsula, Alaska.  Permafrost and Periglacial Processes. vol 14. doi: 10.1002/ppp.446.

Lloyd, A.H. and C.L. Fastie (2003).  Recent changes in treeline forest distribution and structure in interior Alaska.  Ecoscience. 10(2):176-185.

Fastie, C.L., A.H. Lloyd, and P. Doak (2003).  Fire history and postfire development in an upland watershed of interior Alaska.  Journal of Geophysical Research.  Vol. 18, No. D1, 8150.  Doi:10.1029/2001JD0000570.

Lloyd, A.H., T. S. Rupp, C.L. Fastie, and A. M. Starfield.  (2002).  Patterns and dynamics of treeline advance on the Seward Peninsula, Alaska.  Journal of Geophysical Research-Atmospheres. 107(D2): Article no. 8161.

Sveinbjörnsson, B., A. Hofgaard, and A.H. Lloyd.  2002.  Natural causes of the tundra-taiga boundary.  Dynamics of the Tundra-Taiga Interface, Ambio. Special Report No. 12: 23-29.

Lloyd, A.H. and C.L. Fastie.  2002.  Spatial and temporal variability in tree growth and climate response of treeline trees in Alaska.  Climatic Change.  52:481-509.

Lloyd, A.H.  1998.  Elevational controls over foxtail pine seedling growth at treeline in the Sierra Nevada.  EcoScience. 5(3): 250-257.

Lloyd, A.H.  1997.  Response of treeline populations of foxtail pine (Pinus balfouriana) to climate variation over the last 1,000 years.  Canadian Journal of Forest Research. 27:936-942.

Lloyd, A.H. and L.J. Graumlich.  1997.  A 3,500 year record of changes in the structure and distribution of forests at treeline in the Sierra Nevada, California, U.S.A.  Ecology. 78 (4): 1199-1210.

Graumlich, L.J. and A.H. Lloyd.  1996.  Dendroclimatic, ecological and geomorphological evidence for long-term climatic change in the Sierra Nevada, U.S.A.  in Dean, J.S. , D.M. Meko, T.W. Swetnam, Eds.  Tree-Rings, Humanity, and the Environment.  Radiocarbon, Tucson.  Pp. 51-59.

Conkey, L.E., M. Keifer, and A.H. Lloyd.  1995.  Disjunct jack pine (Pinus banksiana Lamb.) structure and dynamics, Acadia National Park, Maine.  Ecoscience.  2(2):168-176.

Lloyd, A.H., W.S. Armbruster, and M.E. Edwards.  1994.  Ecology of a steppe-tundra gradient in interior Alaska.  Journal of Vegetation Science.  5:897-912.

 

Presentations with published abstracts

Lloyd, A.H. and C.L. Fastie.  2017. Rapid change at treeline in Alaska: Insights from remeasurement of permanent plots.   Ecological Society of America.  August, 2017.

Lloyd, A.H. and C.L. Fastie.  2014.  Patterns of Twentieth century treeline advance in Alaska:  insights from dendrochronology and permanent plot studies.  American Geophysical Union Fall Meeting.  December, 2014.

Fastie, G.L. and A.H. Lloyd.  2014.  Effect of shrub cover on spruce seedling establishment at and above alpine treeline in the Alaska Range.  American Geophysical Union Fall Meeting.  December, 2014.  (Poster presentation; abstract #GC23E-0682.)

Lloyd, A.H. and O. Weisser.  2013.  Carbon uptake and storage in old-growth and second-growth forests in central Vermont.  American Geophysical Union Fall Meeting.  December, 2013.  (Poster presentation; abstract #B23B-0558).

Wolken, J.M., D.H. Mann, T.A. Grant III, A.H. Lloyd, T.N. Hollingsworth.  2013.  Nonlinearities, scale-dependence, and individualism of boreal forest trees to climate forcing.  American Geophysical Union Fall Meeting.  December, 2013.  (Abstract # B53A-0429).

Lloyd, A.H., P. Duffy, D.H. Mann, M. Leonawicz, M. Blumstein, E. Pendall.  Threshold responses of aspen and spruce growth to temperature may presage a regime shift in the boreal forest.  American Geophysical Union Fall Meeting.  December, 2011.

Lloyd, A.H.  2010. Divergence, inertia, and change: what variability in the response of boreal forest trees to recent warming tells us about ecological sensitivity to abrupt climate change.  Ecological Society of America Annual Meeting, August 2010.

Weverka, A., D. Mann, A. Lloyd, and R.M. Landis.  Two roads diverge: altered disturbance regime caused indirectly by human activities moves an uncut Vermont forest into an alternate stable state. Ecological Society of America Annual Meeting, August 2009.

Lloyd, A.H. and A.G. Bunn.  2009.  Divergent responses to recent climate warming in Siberian Larix and Picea.  Ecological Society of America Annual Meeting, August 2009.

Hollingsworth, T.N., A.H. Lloyd, B. Charlton, R. Ruess, L. Viereck.  2008.  30 years of change in understory plant communities along the Tanana River: Revisiting the concept of turning points.  American Geophysical Union, December 2008. (Oral presentation by T. Hollingsworth.)

Bunn, A.G. and A.H. Lloyd.  2007.  Whither dendroclimatology?  American Geophysical Union Meeting, December 2007. (invited oral presentation)

Lloyd, A.H. and A.G. Bunn.  2007.  Interspecific variation in tree growth response to 20th century climate variability in the circumpolar boreal forest. American Geophysical Union Meeting, December 2007. (poster presentation)

Lloyd, A.H., C.L. Fastie, A.E. Wilson, and R.M. Landis  2005.  Effects of fire and substrate on black spruce population dynamics in the Brooks Range, Alaska.  Ecological Society of America Annual Meeting, August 2005 (oral presentation)

Lloyd, A.H., A.E. Wilson, and C.L. Fastie.  2003.  Population dynamics of black spruce at its northern limit in Alaska.  Ecological Society of America annual meeting, August 2003.  (poster presentation).

Lloyd, A.H. C. Fastie, K. Yoshikawa, L. Hinzman, M. Fraver.  Impacts of changing permafrost extent on vegetation transitions on the Seward Peninsula, Alaska.  American Geophysical Union, December 2002 (invited speaker)

Chapin, F.S., J. Beringer, H. Epstein, W. Eugster, A. Lloyd, A. Lynch, J. McFadden, D. McGuire, and M. Sturm.  2002.  Vegetation feedbacks to climate warming in Alaskan arctic and boreal ecosystems.  Ecological Society of America annual meeting, August 2002 (oral presentation given by Chapin).

Lloyd, A.H. and C.L. Fastie.  2001. Variability in the sensitivity of arctic and alpine treeline to climate change.  Ecological Society of America annual meeting, August 2001. (invited symposium speaker).

Lloyd, A.H. and C.L. Fastie.  2000.  Climate change and forest expansion on the Seward Peninsula, Alaska.  American Geophysical Union Fall Meeting, December 2000. (oral presentation)

Lloyd, A.H. and C.L. Fastie.  2000.  Spatial variability in 20th century tree growth at arctic and alpine treelines in Alaska.  Supplement to the Bulletin of the Ecological Society of America.  Program and Abstracts.  81: (poster presentation)

Lloyd, A.H.  1998.  Pace and pattern of altitudinal treeline advance in interior Alaska during the 20th century.  Supplement to the Bulletin of the Ecological Society of America.  Program and Abstracts.  79:87. (oral presentation)

Lloyd, A.H.  1996.  Controls over foxtail pine seedling growth at treeline in the Sierra Nevada.  Supplement to the Bulletin of the Ecological Society of America.  77(3):269.  (oral presentation)

Lloyd, A.H. and L.J. Graumlich 1995.  Spatial and temporal patterns of change at treeline in the Sierra Nevada Mountains, CA.  Supplement to the Bulletin of the Ecological Society of America. 76(2): 176. (oral presentation)

Lloyd, A.H. and L.J. Graumlich.  1993.  Late Holocene treeline fluctuations in the southern Sierra Nevada.  Supplement to the Bulletin of the Ecological Society of America.  74(2):334. (poster)

Lloyd, A.H., M.E. Edwards, and W.S. Armbruster.  1992.  Ecology of a steppe-tundra ecotone in interior Alaska.  Supplement to the Bulletin of the Ecological Society of America. 73(2): 252. (poster)

Presentations without published abstracts

Lloyd, A.H., A.Bunn, L. Berner.  2010.  Changes in the growth response of larch to climate variability along a latitudinal gradient in central Siberia.  State of the Arctic 2010.  Miami, FL.  3/15-3/19/2010

Lloyd, A.H., A. E. Wilson, R. Matthew Landis, and C.L. Fastie. 2004.  Dynamics of black and white spruce populations in the southern Brooks Range, Alaska.  International Boreal Forest Research Association (IBFRA) Conference.  Fairbanks, Alaska, May 2004.

Lloyd, A.H., M. Edwards, B. Finney, J. Lynch, V. Barber, N. Bigelow.  2002.  Spatio-temporal variability in boreal forest disturbance regimes: insights from the Very Late Holocene.  Bonanza Creek LTER PI meeting.  Fairbanks, AK.  10/02. (oral)

Lloyd, A.H., T. S. Rupp, and C.L. Fastie.  2001. Dynamics of treeline advance on the Seward Peninsula, Alaska: A comparison of historical patterns and model experiments.  Land-Atmosphere-Ice Interactions All-Hands Meeting.  Salt Lake City, UT.  11/01. (poster)

Lloyd, A.H. and C.L. Fastie.  2000.  Treeline forests and 20th century climate change on the Seward Peninsula, Alaska. Land-Atmosphere-Ice Interactions research group.  Seattle, WA.  2/00. (oral)

Lloyd, A.H. and C.L. Fastie. 1999.  Patterns of treeline response to 20th century climate change in Alaska.  Land-Atmosphere-Ice Interactions research group.  Seattle, WA.  3/99. (oral)

Lloyd, A.H.  1994.  Processes of treeline change in the Southern Sierra Nevada.  International Conference on Tree Rings, Environment and Humanity:  Relationships and processes.  May 17-21, Tucson, Arizona, USA. (oral)

Lloyd, A.H. 1993.  Phenotypic plasticity and the interpretation of long tree-ring chronologies.  Long Chronology Workshop.  December 1-3.  Tucson, Arizona, USA. (oral)

Lloyd, A.H. 1993.  Treeline dynamics in the Sierra Nevada.  Sequoia National Park Principle Investigators Annual Meeting.  Three Rivers, CA. (oral)

Lloyd, A.H., W.S. Armbruster, and M.E. Edwards.  1992.  Paleoecological implications of ecological patterns and processes along a steppe-tundra transition in interior Alaska.  22nd Arctic Workshop.  March 5-7.  Boulder, Colorado, USA. (oral)

Invited talks

March 16, 2010.  Tipping points, Positive Feedback Switches, and the Potential for Rapid Change in Arctic Ecosystems.  State of the Arctic 2010.  Miami, FL. (Keynote speaker)

October 4, 2008.  Effects of climate change on Vermont’s Wildlife.  Dead Creek Wildlife Refuge Wildlife Days, Addison, VT.

September 21, 2008.  The tales trees tell: the natural history of forests on Mt. Independence.  Mt. Independence National Historic Park, Vermont.

October 18, 2007. The Greening of the Subarctic? Effects of Recent Climate Warming on Boreal Forests.  Marvin Seminar Series, Department of Botany, University of Vermont.

September, 2007.  Middlebury College Department of Biology seminar series.

May 2007.  Why Changing Arctic Ecosystems Matter.  Congressional briefing to U.S. Senate and House of Representatives staffers.  (Organized by the Arctic Research Consortium of the United States). 5/22/2007.

November 2006.  Northward movement of forests in the Arctic: Why Changing Arctic Ecosystems Matter.  Panel discussion on “Ecosystem Tipping Points” for Association of Ecosystem Research Centers annual symposium.  11/16/2006.

November 2006.  Northward movement of forests in the Arctic: Why Changing Arctic Ecosystems Matter.  Congressional briefing to staff members of the U.S. House of Representatives Committee on Science.  (11/16/2006)

April 2005.  Population dynamics of black spruce at the species’ northern limit in Alaska.  Université Laval.

April 2002.  Insights from paleoecology about the future of Alaska’s treeline forests.  Marine Biological Laboratory, Woods Hole, MA.

January 2002.  Climate change and the expansion of the boreal forest.  Institute of Arctic Studies, Dartmouth College.

December 2001.  Effects of 20th century warming on treeline forests in Alaska.  Harvard Forest, Harvard University.

November 2000.  The boreal forest in a changing climate.  Dartmouth College, Environmental Studies seminar series.

January 1999.  Impacts of climate change on the boreal forest in Alaska.  University of Vermont, Conservation Biology seminar series.

April 1998.  Impacts of climate change on the boreal forest in Alaska.  State University of New York at Stonybrook, Department of Ecology & Evolution seminar series.

October 3 1997.  Late Holocene treeline dynamics in the southern Sierra Nevada.  Harvard Forest Seminar Series.

October 1996.  Dynamics of treeline in the southern Sierra Nevada.  Bennington College Department of Biology seminar series.

Professional Service

2010-2012: Member-at-Large, Ecological Society of America Governing Board.

2010:  Understand Change Task Force, SEARCH Science Steering Committee

2009-2012: Board of Directors, Arctic Research Consortium of the United States.

2009-2010: Organizing Committee, State of the Arctic Conference

2006-2009: Office of Polar Programs Office Advisory Committee, National Science Foundation (Chair, 2008-2009)

2005-2006: Chair, Surface Dynamics Community of Practice, ARCSS

2005-2011: Editorial Board, Ecology

2000-2004: Science Steering Committee; Land-Atmosphere-Ice Interactions (LAII) Research group (a division of the Arctic System Science program in the Office of Polar Programs at the National Science Foundation).

2000-2003: Chair of the William S. Cooper Award Subcommittee of the Ecological Society of America’s Awards Committee.

1996-present: Reviewer for Ecology, Ecoscience, Canadian Journal of Forest Research, Arctic, Antarctic and Alpine Research, Madrono, Norwegian Journal of Geography, Quaternary Research and several National Science Foundation proposals.