In 1924 Guthrie joined the BBC as a broadcaster and began to produce plays for radio. This led to a year directing for the stage with the Scottish National Players, before returning to the BBC to become one of the first writers to create plays designed for radio performance. From 1929–33, he directed at various theatres, including the Cambridge Festival Theatre in 1929 and a production of Pirandello's "Six Characters in Search of an Author" at the Westminster Theatre in 1932.