The London Chamber Orchestra (LCO) is the longest established professional chamber orchestra in the UK. Based in London, LCO has a residency at St John's Smith Square in Westminster. It was founded in 1921 by the English conductor, organist, pianist and composer Anthony Bernard. He conducted the LCO's first performance, in the salon of No. 4 St. James's Square on 11 May 1921. The London Chamber Orchestra's principal conductor, Christopher Warren-Green, has held the position of Music Director since 1988.