[2] The Embassy Theatre was opened as a repertory company in September 1928 on the initiative of Sybil Arundale and Herbert Jay,[3] when the premises of Hampstead Conservatoire of Music were adapted by architect Andrew Mather.

During that time, he made over 150 new productions and revivals, of which over thirty were then transferred to various theatres in the West End.

[21] Some of the more notable productions at the theatre were: Ronald Adam's own list of significant transfers in that period was Ten Minute Alibi, Close Quarters, The Dominant Sex, Professor Bernhardi, Judgment Day.

[22] Notable productions included: In 1953, it was sold to Sidney Bernstein,[4] with management by screenwriter and playwright Wolf Mankowitz.

Notable productions included: The theatre was sold to the Royal Central School of Speech and Drama, who continue as the resident company, in 1956.