Origins and Early Growth: The practice began in 1945, when Gil Koller established himself as an accountant in Rangiora. In 1947, he amalgamated with the local branch of Burt and McGilvray, later buying out the partnership in 1953 and continuing under his own name. From 1951, the practice was based in Ashley Street, where it remained for 40 years.

Over the years, Gil became a well-known figure in the community — not only for his accounting work but also through his public service. He served three years on the Rangiora County Council and six years on the Rangiora Borough Council, and was active in local swimming initiatives, including the learn-to-swim programme.

A New Home and Continued Growth: In 1991, the firm relocated to its current premises at 267 High Street, Rangiora, taking over the building formerly occupied by the Rural Bank. The move marked a new chapter in the firm’s development, providing a more modern and accessible location for clients and staff.

When Gil passed away in 1992, Brent continued the practice as a sole practitioner, guiding it through a rapidly evolving professional landscape — from the era of handwritten ledgers and typewriters to the digital transformation of accounting.

Koller & Hassall Today: Now under the leadership of Alun Hassall and Kathy Hansell, Koller & Hassall remains committed to the values that have sustained it for eight decades. The firm has grown into a modern and client-focused practice, with a talented team of six accountants and two administrative professionals. Together, they continue to deliver personalised service and expert advice to a diverse and loyal client base.

We remain deeply grateful for the trust and support of our clients — some now spanning three generations — and we look forward to continuing that tradition of service for many years to come.