Jim Zwack has a B.S. in Urban Forestry and an M.S. in Tree Physiology. He is the Director of Technical Services for the Davey Institute. The Davey Institute is the research, training, and educational arm of the Davey Tree Expert Company, which provides a variety of tree care, grounds maintenance and consulting services for residential, utility, commercial, and municipal clients. His staff of technical experts have advanced degrees in entomology, urban forestry, and horticulture, and they provide all forms of technical support to Davey’s service lines across North America.