The mission of Walnut Street Theatre is to sustain the tradition of professional theatre and contribute to its future viability and vitality. It does so through: the production and presentation of professional theatre; the encouragement, training, and development of artists; and the cultivation of diverse audiences and the preservation and chronicling of its theatre building, a national historic landmark. Founded in 1809, Walnut Street Theatre is America's oldest theatre and the Official State Theatre of Pennsylvania. With more than 55,000 season ticket holders, the Walnut is also the most subscribed theatre company in the world.