Diana Grabon
Managing Arborist
Diana Grabon has long had interest in the workings of plants, animals and people. Her previous experience includes gardening throughout the city and managing large scale forest restoration projects with NYC Parks. Diana holds a BS in Biology, a certificate of Horticulture from Brooklyn Botanic Garden and is an ISA and TRAQ certified arborist. She is passionate about plant health-care and diagnostics, right plant/right place, native plants and listening to the trees.
Bill Logan
Consulting Arborist
Bill Logan founded Urban Arborists and now operates as a consulting arborist for the company. He teaches pruning and tree identification at the New York Botanical Garden's School of Professional Horticulture. At the Garden, he also teaches a master class in tree care to foresters of the New York City Department of Parks & Recreation. He has lectured at numerous botanical gardens around the country, including the Arnold Arboretum, the Morton Arboretum, and the Huntington Botanical Gardens. He has published four books of natural history - Oak: The Frame of Civilization, Dirt: The Ecstatic Skin of the Earth, Air: The Restless Shaper of the World and, most recently, Sprout Lands: Tending the Endless Gift of Trees - all from WW Norton. As writer and contributing editor to House & Garden, House Beautiful and Garden Design, and as a garden columnist for the New York Times, he developed a keen sense of what makes a garden beautiful. He is a sought-after consultant to landscape architects, municipalities, companies and individuals.
Griffin Cascarino
Arborist
Griffin joined Urban Arborists in 2025. As a Brooklyn native, Griffin got his start in tree work while living in Colorado. From large scale forestry projects to backyard prunes, Griffin is passionate and excited about all things tree. You can find him bouncing around the city giving estimates, or swinging from a tree over your roof.
Beth Duerr
Operations Manager
Beth has been the Operations Manager at Urban Arborists since 2008. She wears many hats at Urban Arborists but mostly she handles logistics involving non-planting projects. She holds a deep reverence and appreciation of the beauty of trees and gardens. Beth is also an artist and has an MFA in Painting from Parsons School of Design.
Wayne Kammerer
Inventory Arborist
Wayne joined Urban Arborists in 2015 as a tree worker after having been a student of Bill Logan’s at NYBG adult continuing education program. He received a certificate in Arboriculture from NYBG. Moving from a career as a bread baker to one in tree work was like a full circle moment: Wayne’s affinity for trees grew out of exploring the woods and pasture at his grandparents’ farm in northern Illinois while growing up. He first came to New York as a member of the Coast Guard serving on a buoy tender stationed on Governor’s Island when the island was a major Coast Guard facility. He earned a BA in English and History from SUNY Geneseo. He became an ISA certified arborist while at Urban Arborists and now focuses on tree inventories.
Gem Sorenson
Administrative Manager
Gem joined the Urban Arborist team in 2024. They have a BA in Environmental Studies and are currently pursuing their certificate of Horticulture from Brooklyn Botanic Garden. As a native New Yorker and urban ecology enthusiast, Gem is your first point of contact with Urban Arborists. When they’re not at work, Gem can be found researching and writing about death rituals and cultural practices.