TREEKEEPER TREE SERVICE INC was established in 1985 by Dan Sorenson. He is an ISA certified arborist. To obtain certification he had to pass a lengthy exam covering a wide range of topics that included such things as tree biology, pruning, plant health care and safety. A continuing education program is required to maintain certification. This assures you that you are hiring someone from the local Portland area with up to date tree care knowledge and experience. We go out on a limb to provide customer satisfaction. We are licensed, bonded and insured.