A tree trimmer, also known as an arborist, manages the health, maintenance, and appearance of trees by pruning diseased or damaged limbs. Tree trimmers work in a variety of locations such as residences, schools, hospitals, hotels, and indoor mall gardens. Utility companies often contract tree trimmers to clear trees that are close to power lines and remove any debris in the area. Some businesses hire tree trimmers as part of a site’s annual landscaping maintenance. Duties include the use of manual and power tools along with scaffolding equipment, and the operation of heavy machinery, like boom trucks.