Oscar Gustave Rejlander (Sweden, 1813 Clapham, London, 18 January 1875) was a pioneering Victorian art photographer. His collaboration with Charles Darwin on The Expression of the Emotions in Man and Animals has assured him a position in the history of behavioural science and psychiatry. His exact date of birth is uncertain, but was probably 1813. He was the son of Carl Gustaf Rejlander, a stonemason and Swedish Army Officer. He studied art in Rome where he saw photographs of the sights, and then initially settled in Lincoln, England.