We pride ourselves at Davey Tree on providing prompt, professional and personalized service from certified arborists that live, work and engage in your community. Contact one of our Davey Tree specialists for your residential, commercial, utility, or environmental needs.

Jim Zwack
Vice President & General Manager, Environmental Consulting
Jim Zwack is the Vice President & General Manager of Davey Resource Group’s Environmental Consulting team. With over 25 years in the green industry, Jim began his career helping launch a plant healthcare product distribution company, where he advanced to vice president of sales. In 2010, he joined the Davey Institute, the research and training arm of the Davey Tree Expert Company, where he led a team of technical experts supporting Davey’s operations across North America. In his current role, Jim oversees a wide range of environmental consulting services, including wetlands and stream studies, ecosystem restoration, stormwater management, urban forestry, civil engineering and surveying, ecological design, and invasive species management.
Jim holds a bachelor’s degree in urban forestry from the University of Minnesota and a master’s degree in plant physiology from Iowa State University. A frequent speaker and active industry leader, Jim connects knowledge with action to deliver value to clients through innovation and collaboration.