British cartoonist for over 25 years, published in 21 books, and President and co-founder of the Cartoon Museum in London.

Oliver grew up in London and the Cotswolds and from an early age developed a love of cartoons and caricature through the books of H M Bateman, Thelwell, Tintin and Charles Addams. As a child and at school Oliver drew extensively. He is completely self-taught. After Eton College, where he won the Gunther Graphics Prize for Art, Oliver attended Exeter University, and then spent ten years working in the City of London.

However he saw the light in 1995 and left the City to become a full-time cartoonist and illustrator. His early cartoons were published in Punch Magazine, Paris Match, The Beano, The Dandy, The Guardian, Times and Independent and The Spectator, and since 1995 Oliver has been drawing for The Field Magazine. Since autumn 2019  Preston has also drawn cartoons for Country Life Magazine.