Ron Crosby spent 30 years as a court lawyer, particularly in Treaty-related and resource management cases. He is a hearings commissioner and a freshwater commissioner under the Resource Management Act 1991. He has written several books on New Zealand history, including The Musket Wars: A History of Inter-Iwi Conflict, 1806–1845 (1999), Gilbert Mair: Te Kooti’s Nemesis (2004), NZSAS: The First Fifty Years (2011), Kūpapa: The Bitter Legacy of Māori Alliances with the Crown (2015), The Forgotten Wars: Why the Musket Wars Matter Today (2020) and Te Kooti’s Last Foray (2023). Mr Crosby retains a deep interest in New Zealand’s back country and history. His interest in te ao Māori is constantly reinforced by his whānau relationships, his wife, Margy, being of Te Rarawa and Te Aupōuri descent. Mr Crosby was appointed to the Tribunal in 2011.