McKenzie-Smith has written books about Australian Second World War army units and movements. He has been a regular contributor to Sabretache, the journal of the Military Historical Society of Australia.
McKenzie Smith spent some 35 years working on The Unit Guide – a six-volume box set which gives profiles of all 5,700 units that made up the Australian Army in the Second World War. Each profile covers what is known of the unit's formation, role, organisation, movements, operations and place in the army's hierarchy, including references to the unit's war diary at the Australian War Memorial. The series was published in 2018, and led to the Chief of Army awarding Graham a Gold Level Commendation presented at the Army Museum of Western Australia in Fremantle in November 2018.
In the 1980s and 1990s McKenzie-Smith was a forester in Western Australia. When resident in Canberra in the mid-1990s, he was CEO of ACT Forests. He was also a member of the ACT Bush Fire Council in 1998–2000.
McKenzie-Smith is currently resident in Perth, Western Australia.
- McKenzie Smith, Graham R (October 1997). "Encyclopaedia of the Australian Army, 1939 to 1945". Sabretache. 38 (4): 20–30. ISSN 0048-8933.
- McKenzie-Smith, Graham (March 2010). "The unluckiest unit in the Second AIF?: 2/12th Field Ambulance AAMC". Sabretache. 51 (1): 17–20. ISSN 0048-8933.
- McKenzie-Smith, Graham (December 2011). "13 field squadron: The oldest unit in the Australian army?". Sabretache. 52 (4): 40–46. ISSN 0048-8933.
- McKenzie Smith, Graham R (April 1989). "The numerology of the Second AIF (Infantry) 1939 to 1945". Sabretache. 30 (2): 3–11. ISSN 0048-8933.
- McKenzie-Smith, Graham (March 2012). "The other Dick Smith and the Sio code books". Sabretache. 53 (1): 13–16. ISSN 0048-8933.
- McKenzie-Smith, Graham (March 2015). "The army's grocers and truckies: Understanding the Australian Army Service Corps in WW2". Sabretache. 56 (1): 16–22. ISSN 0048-8933.
- McKenzie-Smith, Graham (December 2016). "'We make 'EM and we break 'EM': Understanding the royal Australian engineers in the Second World War". Sabretache. 57 (4): 43–48. ISSN 0048-8933.
- McKenzie-Smith, Graham (September 2016). "'To the warrior his arms': Understanding the Australian army ordnance corps in World War 2". Sabretache. 57 (3): 13–17. ISSN 0048-8933.
- McKenzie-Smith, G (1994), The ebb and flow of the Australian Army in Western Australia, 1941 to 1945, Grimwade Publications, ISBN 978-0-646-17768-7
- McKenzie-Smith, G (1995), Defending the northern gateways: Northern Territory & Torres Strait - 1938 to 1945, Grimwade Publications, ISBN 978-0-646-24404-4
- Trove summary at: https://trove.nla.gov.au/work/230608187?q&versionId=255327945
- McKenzie-Smith, Graham (2018). The Unit Guide: The Australian Army 1939–1945. Mount Pleasant, Western Australia: Big Sky Publishing. ISBN 978-1-925675-14-6.
- Grant, Steve (17 November 2018). "Rare honour for civvy". Fremantle Herald.
- "Graham Robert McKenzie-Smith". honours.pmc.gov.au. Retrieved 25 January 2020.
- McKenzie-Smith, G (2009), Defending Fremantle, Albany and Bunbury, 1939 to 1945, Grimwade Publications, ISBN 978-0-9806291-0-1
- McKenzie-Smith, G; Royal Australian Engineers Association of Western Australia (issuing body.) (2015), Sappers in the West: Army Engineers in Western Australia, Balga, WA Engineers Association of Western Australia Inc, ISBN 978-0-646-93060-2
- McKenzie-Smith, Graham R; Softwood Products (W.A.) Pty Ltd (1986), Submission to Dept of Conservation and Land Management on their draft proposal for the re-adjustment of log prices: prepared for Softwood Products (W.A.) Pty Ltd, The Co, retrieved 27 December 2013
- Thomson, A. B; McKenzie-Smith, G; Wood Utilisation Research Centre (W.A.); Thomson, A (1990), Sawn recoveries from crown logs of radiata pine, Wood Utilisation Research Centre, Dept. of Conservation and Land Management, ISBN 978-0-646-01123-3
- "Drought puts an end to ACT tree-planting plan". The Canberra Times. 69 (21, 676). Australian Capital Territory, Australia. 21 August 1994. p. 2. Retrieved 20 March 2017 – via National Library of Australia.
- "Pine pilferers to pay the price this season". The Canberra Times (ACT: 1926–1995). ACT: National Library of Australia. 17 December 1994. p. 6. Retrieved 27 December 2013.
- "The A.C.T. Bush Fire Council (1998–2000)". National Library of Australia. Archived from the original on 20 January 2003. Retrieved 4 February 2019 – via Pandora: Australia's Web Archive.