Ryan, H. Dennis P.
Professor
413-545-6626
119 Holdsworth
drdr(at)nrc.umass.edu
Primary interests
Dr. H. Dennis P. Ryan is an Arborist and the Program Coordinator of the Arboriculture/Urban Forestry Program at the University of Massachusetts , Amherst . Prior to joining the faculty at the University, Dr. Ryan was Executive Director of Forestry and Horticulture for the Parks Department of the City of New York . In addition to municipal experience, he also worked as a commercial arborist for ten years. Dr. Ryan’s consulting work is in the area of tree and arboricultural accidents and he is Chairperson of the ANSI Z-133 Arboricultural Safety Committee.
Current Projects
- Community forest management systems
- Sustainable streetscape management
- Hazard tree management systems
- Arboricultural safety issues
Courses Taught
- Forestry 232 (3) Arboriculture Fall semester
- Forestry 198 (4) Arboricultural Co-op Fall semester
- Forestry 211 (2) Arboriculture III Spring semester
- Forestry 310 (3) Community forestry Spring semester
Selected Recent Publications
Kane, B. and H. D. Ryan. 2009. Residual Strength of Carabiners Used by Tree
Climbers. Arboriculture & Urban Forestry 35: 75-79.
Rooney, C*., H. Ryan, D. Bloniarz and B. Kane. 2005. The Reliability of
a Windshield Survey to Locate Hazards in Roadside Trees. J. Arboric. 31: 89-94.
Kane, B. & H.D. Ryan. 2008. “How Strong Is That Branch You’ve Tied-in To”. ISA ARBORIST -NEWS 17 (6): 50 – 51.
Ryan, H. D., 2007. “To Cable or Not to Cable”. TREE CARE INDUSTRY
18 (7) 32 – 38.
Ryan, H. D. & B. Kane. 2006. “Z -133 Standard Revisions 2006, Safety Standards for Chain-Saw Use, Climbing, Pruning, Rigging, and Removal”
ISA ARBORIST -NEWS 15 (5): 48 – 50.
Chisholm, S & H. D. Ryan. 2006. “New 2006 Z -133: Using Cranes Safely” ISA ARBORIST -NEWS 15 (4): 48 – 50
Ryan, H. D. & B. Kane. 2006. “Z -133 Standard Revisions 2006, Personal Protective Equipment & Electrical Safety” ISA ARBORIST -NEWS 15 (3): 48 – 50.
Ryan, H. D., C. Rooney, B. Kane & D. Bloniarz. 2005. “Urban Forestry: Windshield Survey Reliability”. TREE CARE INDUSTRY 16 (10) 24-29.
Ryan, H. D. , P. Fisette & D. Bloniarz. 2002. Working with Builders to Save Trees. TREE CARE INDUSTRY 13 (3) 8 – 16.
Kane, B, H. D. Ryan & D. Bloniarz. 2001. "Prioritizing Risk Trees in a
Community". TREE CARE INDUSTRY 12 (7) 45 – 51.
