Founded in 1909, Lesley University is one of the largest teacher education providers in the United States. Based at Cambridge, Mass., the university offers undergraduate and advanced degrees in education, human services, the arts, environmental studies and a variety of other professional fields. It offers its associate, degree and master courses in 23 states as well as online. Its list of programs includes expressive therapies, integrated teaching through the arts, an undergraduate art therapy program and an urban environmental leadership program.