Veterans and Companions

@ Noble Chapel of East Campus of Cypress Lawn Arboretum
on Friday, June 21, 2024
in Colma, CA

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Sale ends Jun 11


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This regional conference will explore lessons and methods of old tree arboriculture practices, with a morning lecture series and afternoon field demonstrations out on the grounds of Cypress Lawn Arboretum and Memorial Park. The subject matter for the day will include proactive and restorative maintenance of mature and post-mature trees, with a special focus on the heritage collection of Monterey cypresses at the Arboretum, the tree that names the place.  Also included in the program will be the intergenerational stewardship offered by the planting of companion trees cultivated in nursery settings, as well as a discussion of the shifting industry standards of tree care for birds and wildlife in the context of dead and dying old trees. Hands-on immersive learning opportunities to understand current arboricultural methods will be taught in-person by leading practitioners in our western chapter region, for a day of knowledge and fun at Cypress Lawn Arboretum!


7:30am Registration and sign-in
8:00am Welcome and Introductions
Josh Gevertz, Arboretum Director, Cypress Lawn Arboretum and Memorial Park, Colma, CA
8:30am Arboretum Heritage Project: Cultivating the next generation
Dave Teuschler, Devel Mountain Wholesale Nursery, Clements, CA
9:30am Caring for Heritage: Lessons of proactive stewardship for the old trees of a historic cemetery
Josh Gevertz
10:30am Break
10:45am Giving Trees a Second Life: Habitat value of dead, dying and decaying trees
Ryan Suttle, HortScience | Bartlett Consulting, Berkeley, CA
11:45am Lunch Provided - East Campus of Arboretum
12:30pm Stewardship by species: Practical methods for care of veteran Monterey cypress (Hesperocyparis macrocarpa) specimens
Christopher Campbell, CC Tree Design, San Francisco, CA and Lawrence Schultz, San Rafael, CA
2:00pm In Practice: Root Excavations and Drone Aerial Inspections
Field demonstration led by Roy Leggitt and Aaron Wang, Tree Management Experts, San Francisco, CA
3:30pm CEU Sign Out
*Please allow up to 6 weeks for processing of CEUs

NOTE:Morning lectures will take place in historic Noble Chapel of East Campus of Cypress Lawn Arboretum (1370 El Camino Real, Colma CA 94014), while lunch and afternoon field sessions and optional walking tour will take place outside on East Campus grounds, primarily in cemetery sections B and C (a map will be provided for further details)


  • Josh Gevertz, Colma, CA
  • Christopher Campbell, San Francisco, CA
  • Roy Leggitt, San Francisco, CA
  • Lawrence Schultz, Berkeley, CA
  • David Teuschler, Clements, CA
  • Aaron Wang, San Francisco, CA

Early Registration (through 6/10/24):

  • $140 - WCISA Member
  • $175 - Non-WCISA Member

Regular Registration (on or after 6/10/24):

  • $165 - WCISA Member
  • $200 - Non-WCISA Member


  • 6.0 - CTM
  • 4.0 - BCMA-P
  • 2.0 - BCMA-M


Christopher Campbell has been a Certified Arborist since 2002, practicing tree care in San Francisco and the Bay Area since 1994. TRAQ qualified since 2013. High quality urban tree care and preservation has been his focus. Mentors include Ted Kipping and Roy Leggitt.

Josh Gevertz has been of service as Arboretum Director of Cypress Lawn Memorial Park for 4 years, as the inaugural arborist in the position since Cypress Lawn was first recognized as an accredited Arboretum through the global ArbNet program in 2019. As speaker for the trees at this cemetery founded in Colma, California in 1892, Josh manages tree care throughout the property, hosts a wide variety of educational and cultural programs, leads community outreach efforts as a vocal ambassador for the Cypress Lawn Heritage Foundation, and embraces his purpose of fostering kinship between people and trees. Josh is a certified arborist through the Western Chapter, as well as a TRAQ- qualified risk assessor, with an interdisciplinary educational background from UC Davis’ College of Biological Sciences and UC Berkeley’s College of Environmental Design, as well as a fellow of the Geraldine Knight Scott traveling scholarship.

Roy Leggitt has a Plant Science degree from Fresno State, and has worked in the Tree Service industry and as a Consulting Arborist for the past 36 years.  He seeks out new experiences in the natural world through travel, backpacking, paleontology, gemology, bird watching, open water swimming and scuba diving.  Arboriculture projects include evaluation of individual trees and large stands of trees up to thousands of acres. He recognizes that managing trees in urban areas cannot be done without the tree service trade industry, and works hard to support those who care for trees.  At Cypress Lawn he has worked over 14 years for change from reaction-based responses where trees were liabilities to a pro-active management strategy that includes recognizing trees as irreplaceable assets that comprise an accredited arboretum.

Ryan Suttle is a consulting arborist & urban forester at HortScience | Bartlett Consulting (H|BC) in Berkeley, CA. He specializes in tree risk assessment and tree preservation projects. Prior to joining H|BC, Ryan worked in utility vegetation management throughout the Bay Area and in New England. He holds an M.Sc. in Arboriculture and Urban Forestry from UMass Amherst. There, his research largely focused on assessing the function, value, and risk of trees along utility rights-of-way in Massachusetts as well as the use of emergent artificial intelligence infrastructure in tree risk assessment.

David Teuschler is the Chief Horticulturist for Devil Mountain Wholesale Nursery. He established the nursery’s propagation program and currently directs the propagation and inventory teams for the company’s sixteen locations across California. David has worked in the nursery industry for three decades, including many years at Valley Crest Tree Company. While there, he served as Plant Health Care Manager for the Specimen Tree Division, Account Manager in the Estate Gardens Division, and, most notably, Chief Arborist for the Apple contract grow, responsible for growing over 7,000 trees – half from seed – for installation at the Apple campus in Cupertino, CA. David is a Certified Arborist and a member of the Western Chapter of the I.S.A. and the I.P.P.S. He is a 3rd generation Californian and has a BS in Ornamental Horticulture from California State University, Fresno.

Aaron Wang has a Forestry degree from UC Berkeley and has worked as a Consulting Arborist with Tree Management Experts for over 10 years. Prior to that he worked for the State of South Dakota as the State Community Forestry Coordinator. Projects include the evaluation of everything from single trees to forest scale analyses. He has worked with Cypress Lawn for almost 10 years and has helped in shifting the management focus from reactionary to proactive. In his spare time, Aaron enjoys woodworking, cooking, brewing, hiking, and camping.


Noble Chapel of East Campus of Cypress Lawn Arboretum
1370 El Camino Real
Colma, CA 94014