Masterpiece (formerly known as Masterpiece Theatre) is a drama anthology television series produced by WGBH Boston. It premiered on PBS on January 10, 1971, making it America's longest-running weekly primetime drama series. The series, which is credited with introducing American audiences to high quality British drama, has presented hundreds of acclaimed British productions. Many of these are produced by the BBC, but the line-up has also included programs shown on the commercial ITV network and Channel 4.