Ola Cohn taught art at Geelong Church of England Grammar School in 1933. She lectured in art at the Melbourne Kindergarten Teachers' College from about 1940 until 1954. In 1964 she received an O.B.E. for 'services rendered in the service of art, especially sculpture'. She sculpted the 'Fairies' Tree in the Fitzroy Gardens, Melbourne, which was inspired by the Elfin Tree in London's Kensington Gardens. She wrote stories around the characters that she carved on the tree stump, publishing The Fairies' Tree (1932), More about the Fairies' Tree (1933) and Castles in the Air (1936).
