His research interests include Indigenous and LGBTI history, and he is the author of Defending Country: Aboriginal and Torres Strait Islander Military Service since 1945 (with Richard Trembath), In Defence of Country: Life Stories of Aboriginal and Torres Strait Islander Servicemen and Women and Defending Whose Country? Indigenous Soldiers in the Pacific War. His forthcoming book (with Shirleene Robinson and Graham Willett), Serving in Silence? Australian LGBT Servicemen and Women, will be published by NewSouth Publishing in 2018.