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|Service/branch||Australian Army Reserve|
|Commands held||4th/19th Prince of Wales's Light Horse|
|Awards||Conspicuous Service Cross|
|Relations||Sir William Upjohn (grandfather)|
Born in Melbourne, Victoria, Upjohn is the son of a Melbourne surgeon and grandson of Sir William Upjohn, surgeon and Chancellor of the University of Melbourne. Educated at the Scotch College, Upjohn graduated with Honours degrees in Law and Arts from the University of Melbourne. As a university student Upjohn joined the Melbourne University Regiment, achieving the rank of lance corporal before undertaking the Herring Course for first appointment as a commissioned officer. He graduated as a second lieutenant into the Australian Army Reserve in March 1989 and was posted to the 4th/19th Prince of Wales's Light Horse.
Since the early 1990s he has pursued a career at the Victorian Bar after being articled at the firm Blake Dawson Waldron in Melbourne. He subsequently studied in London and was awarded a Master of Laws from the University of London.
In 2007 Upjohn was awarded the Conspicuous Service Cross for his outstanding performance as Commanding Officer of the 4th/19th Prince of Wales's Light Horse. He was subsequently appointed to command Australian soldiers in the Solomon Islands. In mid-2011 Upjohn was appointed as an Honorary Aide-de-Camp to His Excellency Alex Chernov, the Governor of Victoria.
- "Queen's Birthday 2007 Honours List: Conspicuous Service Cross (CSC)" (PDF). Australian Government. 11 June 2007. Retrieved 25 January 2014.
- "Allegations Tongan soldiers attacked villagers". Radio Australia. ABC News. 21 March 2012. Retrieved 25 January 2015.
- "Ian W Upjohn CSC SC – Barrister Profile". Victorian Bar. Retrieved 25 January 2015.