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Scientists & Staff

Mark Twery

Title: Supervisory Research Forester
Unit: Sustaining Forests in a Changing Environment
Address: NRS
The University of Vermont Aiken Center; 81 Carrigan Drive
Burlington, VT 05405
Phone: 802-656-1716
E-mail: Contact Mark Twery

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Education

Ph.D., 1987, Yale University, School of Forestry & Environmental Studies, Silviculture
M.S., 1983, University of Massachusetts at Amherst, Forest Ecology
A.B., 1972, Oberlin College, Theater Arts

Current Research

My primary personal research focus is NED, a set of decision-support tools for forest management for multiple benefits. Other research interests include biotic disturbances in forests, regeneration dynamics, stand development, and the roles of humans in the ecosystem.
I have active studies examining the effects of various silvicultural practices on several different components of the forest, including the trees, vascular flora, deer browsing, and salamanders.
I am participating in several studies of beech bark disease, focusing on its effects on the composition and structure of the residual forest.
I have ongoing work addressing public participation in forest planning activities.
I am active in working with educators to develop environmental literacy components to public school curricula. I have collaborative studies working with managers of reservoirs and city parks to develop forest management plans for their properties.

Future Research

Develop integrated decision-support systems for forest management for multiple benefits.
Investigate relative effects of different silvicultural systems for a variety of forest benefits.
Provide tools for urban forest managers to evaluate alternative management activities on their forested properties

Featured Publications

Twery, Mark J.; Knopp, Peter D.; Thomasma, Scott A.; Nute, Donald E. 2012. NED-2 reference guide. Gen. Tech. Rep. NRS-86. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 728 p.
Meador, Cassie; Twery, Mark; Leatherbury, Meagan. 2011. Moving Field Guides. Legacy Magazine. 22(6): 26-27.
Twery, Mark J.; Knopp, Peter D.; Thomasma, Scott A.; Nute, Donald E. 2011. NED-2 User's Guide. Gen. Tech. Rep. NRS-85. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 193 p.
Janowiak, Maria K.; Swanston, Christopher W.; Nagel, Linda M.; Webster, Christopher R.; Palik, Brian J.; Twery, Mark J.; Bradford, John B.; Parker, Linda R.; Hille, Andrea T.; Johnson, Sheela M. 2011. Silvicultural decisionmaking in an uncertain climate future: a workshop-based exploration of considerations, strategies, and approaches. Gen. Tech. Rep. NRS-81. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 14 p.
Twery, Mark J.; Hildreth, Sandra J.; Evans, Celia A. 2008. Bringing the northern forest to your classroom. Gen. Tech. Rep. NRS-21. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station. 59 p.

Additional Online Publications

Dennis, Donald F.; Twery, Mark J. 2007. Choice modeling: public preferences for enhancing benefits from private forests in the Adirondacks. In: Burns, R.; Robinson, K., comps. Proceedings of the 2006 Northeastern Recreation Research Symposium; 2006 April 9-11; Bolton Landing, NY. Gen. Tech. Rep. NRS-P-14. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station: 362-366.
Knopp, Peter D.; Twery, Mark J. 2006. NEDLite user's manual: forest inventory for Palm OS handheld computers. Gen. Tech. Rep. NE-340. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 64 p.
Evans, Celia A.; Lucas, Jennifer A. ; Twery, Mark J. 2005. Beech Bark Disease: Proceedings of the Beech Bark Disease Symposium. Gen. Tech. Rep. NE-331. Newtown Square PA, US. Department of Agriculture Forest Service, Northern Research Station. 149 p.
Kenefic, Laura S.; Twery, Mark J., eds. 2005. Changing Forests - Challenging Times: Proceedings of the New England Society of American Foresters 85th Winter Meeting. Gen. Tech. Rep. NE-325. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 85 p.
Twery, Mark J.; Knopp, Peter D.; Thomasma, Scott A.; Rauscher, H. Michael; Nute, Donald E.; Potter, Walter D.; Maier, Frederick; Wang, Jin; Dass, Mayukh; Uchiyama, Hajime; Glende, Astrid; Hoffman, Robin E. 2005. NED-2: a decision support system for integrated forest ecosystem management. Computers and Electronics in Agriculture 49:24-43
Houston, David R.; Rubin, Benjamin D.; Twery, Mark J.; Steinman, James R. 2005. Spatial and Temporal Development of Beech Bark Disease in the Northeastern United States. In: Evans, Celia A., Lucas, Jennifer A. and Twery, Mark J., eds. Beech Bark Disease: Proceedings of the Beech Bark Disease Symposium; 2004 June 16-18; Saranak Lake, NY. Gen. Tech. Rep. NE-331. Newtown Square, PA: US. Department of Agriculture, Forest Service, Northeastern Research Station: 43-47.
Dennis, Donald F.; Twery, Mark J.; Rechlin, Michael A.; Hansen, Bruce. 2005. Survey Techniques for Assessing Public Preferences for Alternate Silvicultural Treatments in the Adirondacks. In: Bricker, Kelly, comp., ed. 2005. Proceedings of the 2004 Northeastern Recreation Research Symposium. Gen. Tech. Rep. NE-326. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 350-353.
Evans, Celia; Ayres, Matthew; Twery, Mark; Houston, David R.; Liebhold, Andrew. 2005. Using Models to Identify Forests at Risk of Major Structure and Compositional Change due to Beech Bark Disease. In: Evans, Celia A., Lucas, Jennifer A. and Twery, Mark J., eds. Beech Bark Disease: Proceedings of the Beech Bark Disease Symposium; 2004 June 16-18; Saranak Lake, NY. Gen. Tech. Rep. NE-331. Newtown Square, PA: US. Department of Agriculture, Forest Service, Northeastern Research Station: 116-120.
Ward, Jeffrey S.; Twery, Mark J., eds. 2004. Forestry Across Borders: Proceedings of the New England Society of American Foresters 84th Winter Meeting. Gen. Tech. Rep. NE-314. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 44 p.
Knopp, Peter D.; Twery, Mark J. 2004. NED Software for Sustainable Forest Management: New Developments. In: Yaussy, Daniel A.; Hix, David M.; Long, Robert P.; Goebel, P. Charles, eds. Proceedings, 14th Central Hardwood Forest Conference; 2004 March 16-19; Wooster, OH. Gen. Tech. Rep. NE-316. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station: 519.
Twery, Mark; Northrop, Robert. 2004. Watershed forest management using decision support technology. In: Proceedings, Society of American Foresters 2003 national convention; 2003 October 25-29; Buffaly, NY. Bethesda, MD: Society of American Foresters: 373-375.
Dennis, Donald F.; Twery, Mark J.; Rechlin, Michael A.; Hansen, Bruce. 2003. Public attitudes toward programs designed to enhance forest related benefits on private lands. In: Schuster, Rudy, comp., ed. Proceedings of the 2002 Northeastern Recreation Research Symposium. Gen. Tech. Rep. NE-302. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 163-164
Knopp, Peter D.; Twery, Mark J. 2003. Stewplan: software for creating forest stewardship plans (Version 1.3). Gen. Tech. Rep. NE-301. [Computer program]. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 12 p.
Wade, Gary L.; Myers, Jonathan A.; Martin, Cecilia R.; Detmar, Kathie; Mator, William, III; Twery, Mark J.; Rechlin, Mike. 2003. Vascular Plant Species of the Forest Ecology Research and Demonstration Area, Paul Smith's, New York. Res. Note NE-380. Newtown Squre, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 6 p.
More, Thomas A.; Twery, Mark J. 2001. The forest service's recreation agenda: comments on the roles of research and state and private forestry in the Northeast. In: Kyle, Gerard, comp., ed. 2001. Proceedings of the 2000 Northeastern Recreation Research Symposium. Gen. Tech. Rep. NE-276. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 273-275
Twery, Mark J. ; Rauscher, H. Michael; Bennett, Deborah J.; Thomasma, Scott A.; Stout, Susan L.; Palmer, James F.; Hoffman, Robin E.; DeCalesta, David S.; Gustafson, Eric; Cleveland, Helene; Grove, J. Morgan; Nute, Donald; Kim, Geneho; Kollasch, R. Peter. 2000. NED-1: integrated analyses for forest stewardship decisions. Computers and Electronics in Agriculture 27 (2000) 167-193
Hoffman, Robin E.; Twery, Mark J.; Alban, Laura M.; Nyland, Ralph D. 1999. Forests and People. United States Department of Agriculture Forest Service Northeastern Forest Experiment Station Northeastern Area State & Private Forestry, NE-INF-138-99. 12 p.
Thomasma, Scott A.; Thomasma, Linda Ebel; Twery, Mark J. 1998. NEWILD (version 1.0) user's manual [Computer program] . Gen. Tech. Rep. NE-242. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Research Station. 28 p.
Yanai, Ruth D.; Twery, Mark J.; Stout, Susan L. 1998. Woody understory response to changes in overstory density: thinning in Allegheny hardwoods. Forest Ecology and Management. 102: 45-60.
Alban, Laura Miller; Thomasma, Scott A.; Twery, Mark J. 1995. Forest Stewardship Planning Guide (version l.00) user's manual (Computer Program). Gen. Tech. Rep. NE-203. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 15 p. [1 computer disk (3-1/2in.); User's Manual.]
Simpson, Brian T.; Kollasch, R. Peter; Twery, Mark J.; Schuler, Thomas M. 1995. NED/SIPS user's manual: Northeast decision model stand inventory processor and simulator (Version 1.00) (Computer program). Gen. Tech. Rep. NE-205. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 103 p. [1 computer disk (3-1/2 in.); User's manual.]
Muzika, R. M.; Twery, M. J. 1995. Regeneration in defoliated and thinned hardwood stands of north-central West Virginia. In: Gottschalk, Kurt W.; Fosbroke, Sandra L. C., ed. Proceedings, 10th Central Hardwood Forest Conference; 1995 March 5-8; Morgantown, WV.: Gen. Tech. Rep. NE-197. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 326-340
Feicht, David L.; Fosbroke, Sandra L. C.; Twery, Mark J. 1993. Forest stand conditions after 13 years of gypsy moth infestation. In: Gillespie, Andrew R.; Parker, George R.; Pope, Phillip E.; Rink, George: eds. Proceedings of the 9th Central Hardwood Forest Conference; Gen. Tech. Rep. NC-161. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station: 130-144
Gottschalk, Kurt W.; Twery, Mark J.; [Editors]. 1992. Proceedings U. S. Department of Agriculture Interagency gypsy moth research forum 1992; 1992 January 13-16; Annapolis, MD. . Gen. Tech. Rep. NE-170. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 60 p.
Gottschalk, Kurt W.; Twery, Mark J.; [Editors]. 1992. Proceedings U.S. Department of Agriculture interagency gypsy moth research forum 1991; 1991 January 14-17; Annapolis, MD. . Gen. Tech. Rep. NE-167. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 54 p.
Twery, Mark J.; Wargo, Philip M. 1991. Development of a sampling system for Armillaria rhizomorphs in mixed oak stands: a progress report. In: Gottschalk, Kurt W.; Twery, Mark J.; Smith, Shirley I., eds. Proceedings, U.S. Department of Agriculture interagency gypsy moth research review 1990; East Windsor, CT. Gen. Tech. Rep. NE-146. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 128.
Twery, Mark J. 1991. Effects of defoliation by gypsy moth. IN: Gottschalk, Kurt W.; Twery, Mark J.; Smith, Shirley I., eds. Proceedings, U.S. Department of Agriculture interagency gypsy moth research review 1990; East Windsor, CT. Gen. Tech. Rep. NE-146. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 27-39.
Hollenhorst, S.J.; Brock, S.M.; Freimund, W.A.; Twery, M.J. 1991. Effects of gypsy moth infestation on near-view aesthetic preferences and recreation behavior intentions. In: McCormick, Larry H.; Gottschalk, Kurt W., eds. Proceedings, 8th Central Hardwood Forest Conference; 1991 March 4-6; University Park, PA. Gen. Tech. Rep. NE-148. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 23-33.
Twery, Mark J.; Elmes, Gregory A. 1991. Hazard rating for gypsy moth on a Macintosh computer: a component of the GypsES system. IN: Gottschalk, Kurt W.; Twery, Mark J.; Smith, Shirley I., eds. Proceedings, U.S. Department of Agriculture interagency gypsy moth research review 1990; East Windsor, CT. Gen. Tech. Rep. NE-146. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 63.
Gottschalk, Kurt W.; Twery, Mark J.; Smith, Shirley I.; [Editors]. 1991. Proceedings, U. S. Department of Agriculture interagency gypsy moth research review 1990. Gen. Tech. Rep. NE-146. Radnor, PA: U. S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 152p.
Twery, M.J. 1991. Understory composition of hardwood stands in north central West Virginia. In: McCormick, Larry H.; Gottschalk, Kurt W., eds. Proceedings, 8th Central Hardwood Forest Conference; 1991 March 4-6; University Park, PA. Gen. Tech. Rep. NE-148. Radnor, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station: 601-602.
Twery, Mark J.; Patterson, W.A. 1983. Effects of species composition and site factors on the severity of beech bark disease in western Massachusetts and the White Mountains of New Hampshire: a preliminary report. In: Proceedings, I.U.F.R.O. Beech Bark Disease Working Party Conference; 1982 September 26-October 8; Hamden, CT. Sponsored by the USDA Forest Service, Northeastern Forest Experiment Station. Gen. Tech. Rep. WO-37. [Washington, DC]: U.S. Department of Agriculture, Forest Service: 127-133.

Other Publications by Mark Twery *

Mahmoud, Mohammed; Liu,Yuqiong; Hartmann, Holly; Stewart, Steven; Wagener, Thorsten; Semmens, Darius; Stewart, Robert; Gupta, Hoshin; Dominguez, Damian; Dominguez, Francina;Hulse, Hulse; Letcher, Rebecca; Rashleigh, Brenda; Smith, Court; Street, Roger; Ticehurst, Jenifer; Twery, Twery; van Delden, Hedwig; Waldick, Ruth; White, Denis; Winter, Larry. 2009. A formal framework for scenario development in support of environmental decision-making. Environmental Modelling and Software. 24(7): 798-808.
Liu,Y.; Mahmoud, M.; Hartmann, H.; Stewart,S.; Wagener,T.; Semmens, D.; Stewart, R.; Gupta, H.; Dominguez, D.; Hulse, D.; Letcher, R.; Rashleigh, B.; Smith, C.; Street, R.; Ticehurst, J.; Twery, M.; van Delden, H.; White, D. 2008. Formal scenario development for environmental impact assessment studies. In:Jakeman, A.J., et al., eds. Developments in integrated environmental assessment, vol. 3. Amsterdam: Elsevier: 145-162.
Gaertner, S.; Reynolds, K.M.; Hessburg, P.F.; Hummel, S.; Twery, M. 2008. Decision support for evaluating landscape departure and prioritizing forest management activities in a changing environment. Forest Ecology and Management. 256:1666-1676.

*Due to policy or copyright restrictions, we are unable to provide full-text versions of these publications. Please check with your local library or Contact Mark Twery to inquire about reprints.

Last Modified: 02/15/2012