Deborah Niland is the daughter of Ruth Park and D'Arcy Niland. She and her twin sister, Kilmeny Niland, studied at the Julian Ashton Art School in Sydney. Niland has illustrated children's books since 1970 and has worked with a variety of writers including Jean Chapman, Hazel Edwards (the 'Hippopotamus on the Roof' series) and Ruth Park.
Deborah and Kilmeny collaborated to illustrate many books in the 1970s as well as writing and illustrating Birds on a Bough (1975).
Niland has also painted for exhibitions.
Source: Oxford Companion to Australian Children's Literature