Taari is a chartered accountant by training and a fund manager and investment banker by background. He is a director of a number of iwi asset holding companies and an investment advisor to other iwi. He is also a director of Southern Pastures and Taranaki based Parininihi ki Waitotara Incorporation.

Over the past 20 years Taari has been a director of a number of Māori organisations, state owned enterprises, finance and investment groups. Prior to that Taari was an investment banker providing investment advice to major institutions and a fund manager managing the financial assets of major institutions.