Hilton was born in St. Helens in the United Kingdom, and studied at the University of Aberdeen and Hull University. He was employed as an accountant after graduating, but moved into consultancy in the late 1970s, first as a management consultant, and then moving to executive recruitment.
In 2002, Hilton won Labor preselection to contest the new seat of Western Port Province. The seat had replaced the generally safe Liberal seat of South Eastern Province, and been made safer for the Liberal Party in the ensuing redistribution. Amidst the landslide Labor victory at the 2002 state election, Hilton defeated strong favourite and incumbent South Eastern Province Liberal MLC Cameron Boardman on preferences.
During his term in parliament, the Labor government passed sweeping electoral reforms of the Legislative Council which, amongst other changes, reduced the number of members. Hilton was one of the members unable to secure Labor preselection for a seat in the reformed chamber, and he subsequently chose to retire at the conclusion of his term.
- "re-member: Hilton, John Geoffrey ('Geoff')". Parliament of Victoria. Retrieved 25 January 2010.
- Haberfield, Ian (8 December 2002). "New scalp for Labor". Sunday Herald Sun.
- Edwards, Geoff (9 December 2002). "Labor's domination". Frankston Standard.
- "State Results 2002: Western Port Province: Distribution of Preferences". Victorian Electoral Commission. Archived from the original on 6 October 2009. Retrieved 25 January 2010.
- Green, Antony. "2006 Victorian election: Retiring MPs". Australian Broadcasting Corporation. Retrieved 25 January 2010.