Our Team


There’s plenty of effort that goes into the work done by the NZSA – and that’s even before we get to the amazing volunteers who represent us at corporate shareholder meetings!

Oliver Mander


Oliver brings a broad suite of leadership and functional experience to the NZSA – including strategic planning, implementation, technology & digital and finance functions. His strength is as a strategic thinker, focused on transformative solutions, developing and implementing business strategies so that they come to life for organisations. He believes that a strategy means nothing without delivery.
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Teresa Hall


Teresa studied a Bachelor of Commerce, majoring in Marketing and Management in Dunedin after spending a year in Sweden on student exchange. Teresa spent her university holidays working on the ski fields in Colorado. Following university Teresa lived 15 years in the UK working as a senior manager for a major NHS Trust, with a short stint working for Atos, who ran all the IT for the London 2012 Olympics. She returned to New Zealand in 2018 and started with the NZSA in 2021.

Grant Diggle


Grant has worked in New Zealand and international companies in the banking, mineral and mining and motor industry sectors and in public practice as a Chartered Accountant, Chartered Secretary and Auditor. He has also held governance and executive roles at the Blind Foundation, Parkinsons New Zealand and Motor Neurone Disease Association. He is a Director of the British New Zealand Business Association.
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Keeping us all on the straight and narrow…

Andrew Reding

(app 2012)

Andrew was elected as Chair of NZSA in November 2020. Previously, Andrew was Chair of the Auckland branch as well as being a director on the NZSA board. Andrew has an MA from Oxford and an MBA from Cranfield School of Management.
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Martin Hawes

Board Member
(app 2020)

Martin Hawes is an Authorised Financial Advisor and lives in Christchurch.  As well as working as a financial adviser, Martin is a Director of variable annuity provider Lifetime income, Chair of the Summer KiwiSaver Investment Committee, and is a member of the Code Committee for Financial Advisers.
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Ruth Tolise

Board Member
(app 2022)

Ruth has 28 years of commercial experience in financial services, predominantly in the private sector. She has worked in the banking and insurance sectors, managed and led high-performing teams in various areas, including asset services, lending & operations, regulatory, risk and compliance, internal audit, and financial crime anti-money laundering. 
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Louise Nicholson

Board Member
(app 2022)

Louise is a corporate communications specialist, with experience working for government, business, the media and agencies. She has held senior roles in New Zealand, Australia and Asia.

Louise’s specialty is issues and reputation management, with a particular focus on financial communications and the rights of investors.
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Joy Marslin

Board Member
(app 2022)

Joy has worked within the financial services sector for over 30 years in client services, wealth management, investment governance and leadership positions.

Joy holds a number of governance roles including Board Chair of Simplicity NZ Ltd, independent director of Strategi Group, industry representative director for Financial Services Complaints Ltd, director of Impact Enterprise Fund, and independent member of Metis Investment Committee.
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Chris Steptoe

Board Member
(app 2023)

Chris began his journey with  NZSA began back in 2014 when he became a member. In 2016, he joined the Auckland Branch committee and has had an active role in organising speakers for branch meetings.

With a background in technology and funds management, he brings a diverse range of skills and knowledge to the board. His experience as both a retail investor with NZX experience and an analyst for an Australasian fund manager has given him a deep understanding of NZ capital markets. 
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Philip Ascroft

Associate Board Member
(app 2024)

Philip is a senior associate at Chapman Tripp with 13 years’ of experience in corporate and securities law. With experience on many of New Zealand’s most significant initial public offerings and other equity capital markets transactions, Philip acts for issuers, underwriters and shareholders on all aspects of IPOs and capital raisings.

He also advises on listed company compliance and corporate governance, mergers and acquisitions, takeovers and other corporate law issues.

Philip has an LLB (Hons) from the University of Canterbury and is Auckland-based.