Regular pruning is important for trees in urban and suburban areas. Lack of pruning can cause weaknesses in trees, promote insect or disease damage, and pose a danger to pedestrians or property. Other reasons for pruning may include aesthetics, size reduction, or removal of lower branches in pedestrian areas.
Note: Connecticut state law requires that pruning for hire only be performed by a licensed arborist. http://www.ct.gov/deep/cwp/view.asp?a=2710&q=324234