He was previously coached by Mike Corboy, Todd Blythe, Paul Gamble.
Millar has won the 100m-200m sprint double at the New Zealand National Championships five times, in 2011 - 2014 and 2017 - 2018.
His 200m time broke Chris Donaldson's 20-year New Zealand record in the event and qualified him for the 2017 World Athletics Championships.
[5] Millar also won the sprint double at the 2017 Australian Track and Field Champs.
[6] Millar competed in the men's 100 metres at the 2017 World Championships in Athletics.