Born and raised in Invercargill, Grant has a 30-year career in insurance and financial advice. He began with AMP in 1991, rising to Principal Adviser, managing over 20 Advisers. In 1999, he established AMP South before moving to Queenstown to start his own business, Maddison Financial Services.

Grant is a well-respected Adviser, known for his personality and professionalism, specialising in the rural sector, SMEs, and families across Queenstown, Central Otago, and Southland. He works with a wide range of clients, from tradies to high-net-worth families.

Grant is a member of Financial Advice New Zealand and enjoys travel, golf, and soccer and socialising.