Paeroa-born Dr Hubbard graduated from Massey with a Bachelor of Technology (Food) in 1970. He worked as a research scientist for the Co-Operative Dairy Company in Hamilton developing specialised powders for the baking trade, then spent several years managing the Food Processing Factory in Niue.
After working in management roles, including chief executive, at Tasti Food Products for 13 years, he and wife Diana Reader set up Hubbard Foods in 1988. The company gained prominence for its promotion of socially responsible business perspectives. Dr Hubbard founded the New Zealand Businesses for Social Responsibility (now the Sustainable Business Network), was chair of the New Zealand National Parks and Conservation Foundation and a supporter of Outward Bound. He was Mayor of Auckland from 2004 to 2007 and member of the Massey University Council 2003-06.
He was conferred with an honorary Doctor of Science in 1999. In 2017 Hubbard Foods was sold to the HFG Group. Dr Hubbard was quoted as saying “after making three billion bowls of mueslis and cereals over 30 years, it was time to hand over the reins to a younger generation”. In recent years her has given his time as an Ambassador for the Massey University Foundation’s Refectory Restoration project.