Meet Our ISA Certified Arborists

Bob McMullin

Bob McMullin

Bob founded Keystone Tree Experts in 1968 after working in the tree care industry for six years. He attended Pennsylvania State University as a forestry major and still maintains a professional relationship with many university staff members. He has held numerous positions within the Pennsylvania - Delaware chapter of the International Society of Arboriculture (ISA) including serving as President in 1990 and 1996. He was a founding member of the Southeastern PA IPM Research Group. Bob is a frequent speaker at horticultural seminars and on local radio programs. He is based in Doylestown where he cares for many residential and commercial properties. He is also the municipal arborist for Doylestown borough and township.

Dave Ferrier

Dave Ferrier

Dave has been with Keystone Tree Experts since 1986 covering the Solebury, Bucks County area. He is an ISA Certified Arborist and a 1979 graduate of Colorado State University with a B.S. in Ornamental Horticulture. His 32 years of horticultural experience has helped to establish his broad-based knowledge of the insect and disease problems affecting your trees and shrubs. Contact Dave to design a custom Plant Health Care (PHC) program for your property by calling our Solebury or Doylestown office.

Herb Hickmott

Herb Hickmott

Herb joined Keystone Tree Experts in 1992 after working in the landscape design business. He is a 1979 graduate of Delaware Valley College with a B.S. in Ornamental Horticulture. He is an ISA Certified Arborist and a Pennsylvania Certified Horticulturist. Herb has also served on the Executive Board of the Pennsylvania - Delaware Chapter of the International Society of Arboriculture. He is a member of the Plumstead Township Environmental Advisory Council and the Cheltenham Township Shade Tree Commission. His extensive background in landscape design, PHC programs and insect control ensures that his customers receive the highest level of expertise in evaluating their properties.

Rick Heitmann

Rick Heitmann

Rick has been with Keystone since 2005 and has many years of tree care experience including tree pruning/removal, insect and disease identification and treatment. He currently works as a Plant Health Care Technician and uses his expertise to maintain residential and commercial properties.

Joe Landes

Joe Landes

Joe started at Keystone in 2012 and is an ISA Certified Arborist. He grew up in Doylestown and is a Central Bucks graduate. He started as a Plant Health Care Technician and is our arborist representative in the Upper Bucks area. Joe's knowledge includes tree and shrub identification, insect and disease control in addition to general tree maintenance.

Lynne McMullin

Lynne McMullin

Lynne McMullin has been working at Keystone since 1997. She has a degree in Chemical Engineering from Lehigh and is also an ISA Certified Arborist. She works in the office full time, so in many cases, she can answer your tree and shrub questions over the phone.