Terrence P. Flanagan | Curriculum Vitae

(Download Terrence Flanagan’s CV)

A career in arboriculture since 1977 starting in the Boston, Massachusetts area, 10 years in Colorado and the remaining 20 years plus in Oregon. 

Consulting Practice 

  • Practicing consultant since 1985
  • Board Certified Master Arborist since 2004 (#PN-0120BMT)
  • Certified Tree Risk Assessor since 2006 (# 0152)
  • TRACE Instructor since 2007
  • Certified Arborist since 1990 (# PN-0120A)
  • Certified Tree Worker since 2001 (#PN-0120AT)
  • Certified Municipal Specialist since 2004 (#PN-0120AM)
  • Member of American Society of Consulting Arborists since 1997
  • Member of the International Society of Arboriculture since 1983

Educational Background

Conference Attendance: 

  1. American Society of Consulting Arborists
  2. International Society of Arboriculture
  3. Oregon Community Trees Annual Summit
  4. Regional Training Conference of the Pacific Northwest Chapter of the International Society of Arboriculture
  5. Oregon Golf Course Superintendents Association Winter Seminar
    Appraisal Workshops – Sponsored by ISA chapters and American Society of Consulting Arborists from 1982 to present, latest seminar, two-day seminar in 2005
    American Society of Consulting Arborist Academy, 1996
    Dale Carnegie’s “Sales Course” 1986
    Bachelor of Science – Natural Resource Management, Colorado State University, 1981

Major Course Work

  • Plant
  • Physiology
  • Botany
  • Dendrology
  • Ecology
  • Soils
  • Public Speaking
  • Surveying
  • Visual Landscape
  • Managment
  • Land Use Planning
  • Natural Resource
  • Public Relations
  • Integrated Resource Managment
  • Watershed Managment
  • Forest Entomology
  • Forest Managment


  • Natrual Resource Polisy & Administration
  • Business Writing
  • Business Management
  • Silverculture
  • Wildlife Managment
  • Forest Ecology
  • Wildlands Fire Management

Associate of Arts – Massachusetts Bay Community College, 197 

Work Experience 

Teragan & Associates, Inc. President
3145 Westview Circle Lake Oswego, OR 97034
(503) 697-1975

Arboricultural Consultant 2000 to present – Consultant providing arboricultural information to guide development and management of trees, shrubs and other horticultural plants on commercial, municipal and residential property. Services provided include Tree Protection Plans, Hazard Tree Assessment, Tree and Shrub Appraisal, Tree Preservation Strategies on Development Sites, Tree and Shrub Care Management, Pruning and Tree Climbing Instruction, Arboricultural Instruction, Urban and Community Forestry Programs, Tree Surveys, and Expert Witness Testimony. 

Clackamas Community College
Horticulture Department
19600 South Molalla Avenue
Oregon City, Oregon 97045
(503) 657-6958 x 2389
Supervisor: Elizabeth Howley

Horticulture Instructor 1998 to present – Part-time instructor for Horticulture courses. Courses taught include Introduction to Arboriculture, pruning, tree climbing, landscape installation and chainsaw use and maintenance. Classes consist of lecture, practicum and field trips. Hands on instructions are a major focus that enables students to practice what is learned in class. 

General Tree Service, Inc.
P.O. 2049
Clackamas, OR 97015
(503) 656-2656
Employed 10- 87 to 10-00
Supervisor: John Landon

Manager of Business Development 1997 to 2000 – responsible for the introduction of General Tree Service and Barclays Gardens to prospective commercial accounts and public organizations. Duties included business acquisitions, specialty training, special projects, arboricultural and landscape consulting. Also responsible for landscape construction sales consisting of irrigation installation, site prep, hardscape installation, and planting.

Manager of Landscape Construction Division 1996 to 1997 – Responsible for the reorganization of the Landscape Construction Division to a profitable entity. Responsible for personnel hiring, training and profitability of the division.

Manager of Tree Division 1987 to 1997 – Responsible for the profitable operation of tree division at General Tree Service. Division consisting of up to fourteen employees responsible for the pruning of trees and shrubs of all sizes. Duties include the supervision of operational and safety training of all employees, hiring and supervision of all personnel, purchasing and inventorying of equipment, maintenance management of equipment, budgeting and monitoring for profitable performance. Responsible for the writing and implementation of company’s first formal safety policy. Responsible for substantial growth in the tree division while maintaining constant profit margins. Member of company management team, responsible to guide company’s profitable performance while maintaining professional standards.

B.D. Wilhelm Company, Inc.
8200 E. Harvard Ave.
Denver, CO 80231
(303) 755-7432
Employed 2-86 to 8-87
Supervisor: Steve Day

Arboriculture Salesman – Consulting and sales for progressive arboricultural firm. Service sales to residential and commercial clients of tree and shrub pruning and removing, lawn care, integrated peat management programs, design and installation of landscapes. Conducted training sessions for field personnel. Managed and operated diagnostic plant and soil lab. 

Blossom Tree Care
5405 Estes Court Arvada, CO
(303) 421-6101
Employed 5-84 to 11-85

Arborist – One of three working in a small, quality oriented tree care company. Duties included sales, pruning and removal of large trees to shrubbery, proper and careful application of pesticides to residential and commercial properties, and the maintenance and light repair of equipment.

Swingle Tree Company
8585 E. Warren Ave.
Denver, CO 80231
(303) 337-6200
Employed 11-82 to 5-84
Supervisor: Chuck Morgan

Arborist, Training Supervisor – Responsible for training and supervision of new personnel to use safe and efficient practices to remove, prune and care for landscape plants while completing work myself as a regular production foreman. Also responsible for tool inventories on all fleet vehicles and company storerooms.

Byron O. Reid Inc.
St. Vrain Street
Colorado Springs, CO
Employed 6-81 to 11-82
Supervisor: Byron Reid

Manager of Tree Division – Hired and supervised all personnel. Scheduled and routed daily work consisting of pesticide applications and tree work. Responsible for sales of tree care services consisting of tree and shrub pruning and removal, plant health care programs and landscape fertilization. Completed actual work on more difficult contracts as well as maintained and serviced trucks and equipment.

Lowden, Inc
Chestnut St.
Needham, MA 02192
Employed 6-78 to 8-78

Summer Employment – Hired to assist in the cleanup of a late, May 5 snowstorm that caused tremendous damage to trees in the Boston area. Started as ground worker and quickly became a climber trainee due the amount work to be done. Operated all associated equipment such as chippers, chainsaws, loader, trucks of various sizes.

Other Work Experience

  • U.S. Forest Service Fire fighter, surveyor, lands staff assistant
  • Bernard Custom Homes Carpenter

Professional Organizations / Volunteer Work / Awards and Skills

American Society of Consulting Arborists
Member 1996 to present

Graduate of Arboricultural Consulting Academy, 1996

International Society of Arboriculture
Past Board Vice President of the International Board of Directors, 2002 to 2008 Director on the Certification Board of Directors, 2005 to present
Chair of Tree Risk Qualification Committee
Director on the International Board of Directors, 2000 to present
Executive Committee Liaison of Plant Value Appraisal Committee, 2005 to 2008
Executive Committee Liaison of Student Activities Committee, 2004 to 2008
Executive Committee Liaison of International Safety Committee, 2005 to 2008
Member since 1983

Pacific Northwest Chapter – International Society of Arboriculture
Member since 1987, board member since 1988
Chapter International Board Representative 2002 to present
Tree Risk Assessment Course Instructor, 2007 to present
International Certification Representative, 1998 to 1999
Past president, 1996 to 1998
President, 1994 to 1996
President Elect, 1993 to 1994
Annual Conference Chair, 1992
Treasurer, 1988 to 1992

Hoyt Arboretum
Volunteer work, 1988 to present
Board of Director Member, 1999 to 2002
Vice President 1999 to 2002
Chair of Plant Collection Policy Committee, 1993 to 2002
Chair of Annual Arborists Work Party, 1989 to 2005
Lecturer on Pruning and Arboricultural Care, 1989 to 2000

Oregon Community Trees
Member since 1992 President 1999 to 2001
Past President 2001 to 2003

American Society of Landscape Architects
1998 Portland Convention Committee

Friends of Trees
Volunteer work, 1989 to present
Chair of tree selection committee 1997 to 2000
Member of Charter Board of Directors
Crew leader of tree planting projects, instructor at crew leader training workshop, instructor at tree team workshop Sponsor of tree planting event

Oregon Association of Landscape Contractors
Member 1996 – 2004
Lecturer at annual conference

Owen Sabin Skills Center
1989 to 1999, Forestry and Natural Resources Program Advisory Committee

Oregon Arbor Week Council
Board Member, 1988 to 1989

International Society of Arboriculture, Rocky Mountain Chapter
Member 1981 to 1987
Board Member 1983 to 1987
Treasurer 1987
Secretary 1983 to 1986


Awards and Skills

President’s Award 2005, Pacific Northwest Chapter, ISA
President’s Award 1998, Pacific Northwest Chapter, ISA
Arboricultural Award, 1991, Pacific Northwest Chapter, ISA
Co-Champion, 1986- Rocky Mountain Chapter Climbing Jamboree, Denver, Colorado
EHAP- Electrical Awareness Program Certified 1992 to 1997

Past Licenses

Oregon Pesticide Applicator
Oregon Pesticide Consultant
Colorado Pesticide Applicator


Instructor for Tree Risk Assessment Course and Exam
Part time Instructor for Clackamas Community College Horticultural Program