Mark co-ordinated courses in Children's Literature and Australian Literature at Macquarie University and courses in Australian Literature and Film for Rollins College, Florida for many years before becoming Children's Publishing Director at Random House Australia.

He published books for young readers and for adults under his own name imprint at Hodder Headline and was Project Manager of 'My Favourite Book' for ABCTV.

Well known as a television and radio presenter, he also writes books for young readers. Mark has been president of the NSW branch of the Children's Book Council of Australia and national president in 2005-6.

He has won the CBCA Lady Cutler Award and the Australian Publishers Association Pixie O'Harris Award for distinguished services to children's literature.