Sir John Ronald Leon, 4th Baronet (born 16 August 1934) is an English actor and baronet who is known as John Standing. He is the stepson of John Clements. Standing was born in London, the son of Kay Hammond (née Dorothy Katherine Standing), an actress, and Sir Ronald George Leon, 3rd Baronet, a stockbroker descended from Sir Herbert Leon, the builder of Bletchley Park. He succeeded his father as the 4th baronet in 1964, but does not use the title. The Leon family were, until 1937, owners of Bletchley Park, the country house in Buckinghamshire used in the Second World War as a code-breaking centre. He was educated at Eton College and Millfield School, Somerset. He served in the King's Royal Rifle Corps as a second lieutenant, before going on to study at the Byam Shaw School of Art in London