Quentin competed at the Olympic Games in London 2012 and Rio 2016, finishing 27th and 12th respectively in the 50km race walk.
At the 2017 World Championships in London, he finished 12th in a New Zealand record of 3:46:29 before finishing 11th in the same competition two years later in Doha.
He finished fifth at the 2018 Commonwealth Games in the 20km race walk with a time of 1:21:47.
He holds multiple New Zealand records for the 3000m, 10,000m, 20km and 50km race walks.
Coached by Brett Vallance, he is a member of the Wellington Harrier Athletic Club.
The 33-year-old physiotherapist lives and trains in Melbourne, a stronghold of Australian race-walking.
He is a member of the Athletics NZ Athletes' Commission, which serves to provide a voice to high performance athletes and also includes other high-profile athletes such as Dame Valerie Adams, Eliza McCartney and Tom Walsh.