Do all tree companies have arborists on staff?

Unfortunately, not every tree company have trained arborists on staff.

When looking for a tree service with an arborist on staff, be sure to look for International Society of Arboraculture (ISA) certification. These arborists require a course of study, years of field work & an extensive exam that must be passed in order to become ISA certified. Finding an ISA certified arborist will ensure the best, most professional tree care possible. Currently, Hansen’s has 10 ISA certified arborists on staff.