Contact Information
Level 4/21 Queen Street, Auckland CBD, Auckland 1010
About Us

William Buck is a leading firm of Chartered Accountants and advisors with offices across Australia and New Zealand. Established in 1895, we have over 100 directors and 600 professional staff, and are wholly owned and operated in Australia and New Zealand.

Throughout our history, we have assisted individuals, progressive businesses and community organisations, with a particular focus on the middle market. Remaining true to our core client base has enabled us to develop a depth of knowledge and expertise specific to our clients’ needs.

William Buck’s strength lies in our unique philosophy summed up by the simple phrase, ‘Changing Lives.’



360 Degree support

As a client of William Buck you’ll benefit from our integrated services model.

We’ll listen closely to your needs and bring together the relevant professionals across a number of specialities and locations; providing a responsive, personalised solution.

Bringing our services together in a truly integrated manner ensures that you receive the right advice at the right time and derive long-term value from your relationship with us.

That’s what we mean by 360 degree support.



It’s more about the journey than the destination – enjoy the ride!”






Martinus is committed to building meaningful relationships with his clients. He believes strongly that excellence is developed through cohesive teamwork and that ‘a personal effort can only get you so far’. 

His hands-on working style is evident through his guidance of CA candidates. As a NZICA registered mentor , he takes great pride in the responsibility of guiding candidates through the qualification process, coaching them to take responsibility for their own destiny and providing direction when required.

Martinus’ expertise spans in tax, accounting, and business advisory. Having held highly regarded positions in public practice, the commercial sector and in academic institutions; Martinus’s holistic knowledge stems from over 25 years of business experience.

Martinus thrives on helping start-ups find their feet in challenging business environments. His core pursuits revolve around preparing business plans, designing financial models and structuring effective business processes whilst facilitating growth.

Working closely on a wide range of business projects, Martinus strives to truly understand his clients’ needs and achieve their goals.