Sentinel Tree was founded in 2025 by Ryan Jones after a nearly 20 year career in arboriculture and Park operations. Ryan has had the ability to work in many facets of the industry in public sector organizations to include National Park Service, Maryland National Capital Park and Planning Commission- Montgomery Parks, and City of Frederick Parks. He trained with Olmsted Center for Landscape Preservation in Boston Massachusetts and has performed work at many historical sites and cultural landscapes throughout the National Park Service. He has acquired many industry certifications to include International Society of Arboriculture (ISA) Certified Arborist, ISA Tree Risk Assessment Qualification (TRAQ), Maryland Department of Natural Resources Licensed Tree Expert, Maryland Department of Natural Resources Roadside Tree Expert, Tree Care Industry Association Certified Tree Care Safety Professional (CTSP), Maryland Department of Agriculture Commercial Pesticide Applicator License, and Maryland Department of Agriculture Professional Fertilizer Applicator License.