Warren was educated at Massey University, New Zealand, and at Roseworthy Agricultural College, South Australia. He began his winemaking career in New Zealand in 1987, subsequently travelling the world as a Flying Winemaker, including vintages in Australia, Italy, Hungary, France, and California.
In 1997, Warren returned to New Zealand to take up the role of Chief Winemaker at Trinity Hill. He also heads the Viticultural team and controls the vineyards. 2024 was his 28th vintage with Trinity Hill.
Over the years Warren has been a judge at most of New Zealand’s major wine shows and has been an International Judge at several top Australian competitions. He was Chairman of Judges for (formerly) Air New Zealand Wine Awards and the Sydney International Wine Competition. In 2015 he was selected as the visiting Winemaker for the Walter, Carew, and Richard Reynell Fellowship as a guest of the University of Adelaide mentoring Hickinbotham Roseworthy Oenology students.