PEN American Center (PEN), founded in 1922 and based in New York City, works to advance literature, to defend free expression, and to foster international literary fellowship. The Center has a membership of 3,300 writers, editors, and translators. PEN American Center is the largest of the 144 centers that belong to International PEN, the worldwide association of writers that defends those who are harassed, imprisoned and killed for their views. This center should not be confused with PEN Center USA, which is located in Los Angeles and was founded in 1943.