Mark A. Webber, Board-Certified Master Arborist and Horticultural Expert

Mr. Mark A. Webber, Board-Certified Master Arborist and Horticultural Expert

Robson Forensic Inc.

Available Nationwide , OH 43017
Mobile: 937-604-2291
Office: 800-813-6736


Mark Webber is a Board Certified Master Arborist and a Certified Professional Horticulturist with nearly forty years of relevant professional experience. He provides investigations, reports, and testimony in matters related to tree condition, maintenance and removal; management of nursery, arboricultural, and landscaping operations; and an assortment of horticultural issues.

Mark started working at farms and nurseries in 1975. He remains active in his industry as the Founder/Co-owner of a landscaping nursery and farm. His company provides a full range of landscape design and installation, tree evaluation, lawn care, weed control, tree and arboricultural services, drainage improvements, and installation of retaining walls. Mark also worked for some time as a Research Assistant for the BASF Corporation involving fungicides, insecticides, and herbicides and as an Apiary (Honey Bee) Technician for The Ohio State University.

Mark earned a Bachelor of Science degree in Horticultural Science with a minor in Agricultural Business from The Ohio State University. He is designated as a Board Certified Master Arborist by the International Society of Arboriculture, and is a Tree Risk Assessment Qualified Arborist and is a Master Nursery Technician by the Ohio Nursery & Landscape Association. He is also recognized as a TechArborA by the UK’s Arboricultural Association, a New Jersey Licensed Tree Expert, and a Licensed Arborist in multiple states. The board of the American Society of Horticultural Science has designated Mark as a Certified Professional Horticulturist.

Mark is the only Board-Certified Master Arborist in the United States that is designated as a TechArborA in the United Kingdom as of 10/28/15.

Areas of Expertise

  • Agricultural
  • Crops
  • Forestry
  • Insects & Pests
  • Landscape Design
  • Pesticides
  • Tree/Arborist
  • Trees Appraisal
  • Vineyards

Expert Background

Q: Please list your professional accreditations, degrees, licenses, and certificates granted:
A: The Ohio State University A.A.S & B.S. Horticulture 1979-1984
Master Ohio Nursery Technician #282 2005-present
Certified Arborist, International Society of Arboriculture 2001-2013
Board Certified Master Arborist, International Society of Arboriculture 2013-present
Certified Professional Horticulturist, American Society of Horticultural Science 2017-present
Wildlife Certified Protector #677, Wildlife Training Institute 2014-present
TechArborA, Level 3 Qualifications in the UK arboricultural grade system 2015-present
New Jersey, Certified Tree Expert 2016-present
Profesional Arborist-Minnesota, Maine, Rhode Island, New Jersey
Q: Please list your affiliations or memberships in any professional and/or industry organizations:
A: Arborist Association (United Kingdom) 2015-present
Arboricultural Research and Education Academy 2015-present
International Society of Arboriculture, 2000-present
Ohio Nursery and Landscape Association 1997-present
Education and Scholarship Committee member, 2010-present
Plant Selection Committee member, 2009-2010

Jefferson Twp. Farmers’ Market, Founder and President 2011-2013
Garden Academy of the Dayton Home and Garden Show, Founder 2008
Cox Arboretum, Dayton Ohio Board of Directors, 2004-2005
Ohio Chapter, 2000-present
Education and Public Outreach Committee, 2013-present
Florida Chapter, 2014-present
Indiana Chapter, 2013-present
Kentucky Chapter, 2000-present
Mid Atlantic Chapter, 2014-present
Midwest Chapter, 2015-present
New England Chapter, 2014-present
New Jersey Chapter, 2014-present
New York State Chapter, 2014-present
Pacific Northwest Chapter 2015-present
Pennsylvania-Delaware Chapter, 2014-present
Southern Chapter, 2015-present
Western Chapter, 2014-present
Wisconsin Chapter, 2014-present
Utility Arborist Association 2012-present
Urban Tree Growth and Longevity Working Group 2014-present
Q: Please list any teaching or speaking experience you have had, including subject matter:
A: Tree Care Basics: “Selection, Planting, Training, Hazard Recognition, and more…...Cox Arboretum
Five Rivers Metro Parks, March 2017

"Hazard Tree Training for Insurance Professional." Independent Insurance Agents and Adjusters
of Dayton, Ohio, November 2016

Arboricultural Practices of Importance -Planting, Pruning and More. The Ohio State University
Green Industry Short Course at the Ohio Turf Grass Foundation Meetings, Columbus, Ohio,
December 2016

Horticulture Basics, Part 1. American Planning Association Ohio Chapter, Dayton Ohio Sinclair
Community College, December 2015

Landscape Design and Care. American Planning Association Ohio Chapter, Dayton Ohio Sinclair
Community College, December 2015

“The Future of Trees is in Your Hands – The Best Practices of Tree Planting,” Ohio Chapter ISA.
Created and developed an 8-hour program for continuing education for the Best Practices of
Tree planting for Green's Professionals, October 2014-February 2015

“The Loss Generation of Trees,” Slide show and background of tree planting failures, Cox
Arboretum and Gardens, Dayton Ohio, Ohio Chapter ISA, February 2015

“Site Selection & Soil Conditions for Tree Planting,” Cox Arboretum and Gardens, Dayton Ohio,
Ohio Chapter ISA, February 2015

“Planting Specifications for Tree Planting, meeting ANSI A300 part 6,” Dayton Ohio, Ohio Chapter
ISA, February 2015

“In class exercise practicum of tree planting failures workshop,” Dayton Ohio, Ohio Chapter ISA,
February 2015

Q: For what area(s) of expertise have you been retained as an expert?
A: Provide technical investigations, analysis, reports, and testimony toward the resolution of
commercial and personal injury litigation involving Arboricultural and Horticultural issues that
include tree and branch failures, pruning practices, work and business practices, tree risk
assessment practices, landscape design, dendrology, dendrochronology, wood decay, wood
identification, weed control, plant selection, plant root-sidewalk interface, garden center
operations, nursery production, fertility treatments, bee keeping, plant value determinations,
maintenance, site drainage, hardscaping, parks, farming practices, bike/hike paths, retaining walls,
street trees, herbicide injury, stone fruit, apple, small fruit, viticulture, vegetable production
practices including organic and conventional means.


References upon request.