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Our people

Our people make the difference and drive our success

We bring a diverse team of people to the table, each with significant expertise and experience within their fields. Their leadership, energy and enthusiasm is evident in all that we do. We always do the right thing and are straight forward with each other.


We demonstrate integrity, respect and work as a team to build mutually beneficial relationships and partnerships.

Board of Directors

David Bortolussi


Managing Director and CEO of The a2 Milk Company
David joined The a2 Milk Company in February 2021 from his most recent role as Group President – International Innerwear, Hanesbrands. He joined Pacific Brands in 2009 initially as Chief Financial & Operating Officer taking over as CEO of the public company in 2014.

In 2016, Hanesbrands acquired Pacific Brands and expanded David’s role to cover Australasia and subsequently its international innerwear operations outside of the Americas.

Prior to this David spent five years at Foster’s Group, where he held the role of Chief Strategy Officer responsible for corporate strategy, M&A, business development and performance improvement. Prior to Foster’s Group, David held senior consulting roles at McKinsey & Company and PwC. David’s career has largely been focused on the Consumer and Retail sector in Australia and New Zealand complemented by significant international experience in various markets and categories in China, SE Asia, EU and the US.

Siyuan Cao


Project Manager and Finance Specialist of the Dairy Development Office in China Animal Husbandry Group (the largest Chinese SOE in Animal Husbandry and shareholder of Mataura Valley Milk Limited and the major shareholder of BODCO Limited), Director of Mataura Valley Milk Limited and Financial Representative of BODCO Limited.

Mr. Cao has experienced skills in financial management and capital raising, he was deeply involved in the founding of Mataura Valley Milk and has contributed his intelligence in financial support for MVM in the past years.

Chopin Zhang


Chopin joined The a2 Milk Company in November 2022 and has over 35 years of experience in supply chain management with significant experience in China and New Zealand, including planning, procurement, manufacturing, quality, cross-border trade, distribution, regulatory affairs, and government relations. Chopin has extensive experience in the China infant milk formula (IMF) market, having held senior executive and supply chain leadership roles with Yashili and Danone.

During his career, Chopin has held additional supply chain senior leadership roles across Greater China, Asia Pacific and the USA with leading consumer goods companies including Starbucks, Nike and Johnson & Johnson.

Chopin’s expertise in the China infant milk formula industry and experience across New Zealand and China are essential as he leads the transformation of The a2 Milk Company’s supply chain to enable further market access, innovation and growth.

David Muscat


As CFO of The a2 Milk Company, David is responsible for finance, investor relations, risk and IT across the Group. David is a capable and experienced finance and people leader with a demonstrated history of working in a dually-listed company (NZX/ASX) and working directly with the Board of Directors and the Audit and Risk Committee.

Prior to joining the Group, David was the CFO of DIM Brands International (formerly Hanes Europe Innerwear), and prior to this was the CFO of Hanes Australasia. David was the CFO of ASX and NZX-listed Pacific Brands prior to its takeover by Hanesbrands Inc. in 2016. David commenced his career at Deloitte and has gained significant experience in the apparel, consumer goods and retail sectors in various international markets, including China.

Deyong Zhang


Chief Compliance Officer and General Manager of International Business of China Animal Husbandry Group (the largest Chinese SOE in Animal Husbandry and the major shareholder of Mataura Valley Milk, BODCO Limited). Director of Mataura Valley Milk and BODCO Limited MVM, BODCO.

Prior to working for the China Animal Husbandry Group, Mr. Zhang worked for the Ministry of Agriculture, the P.R.C. and has become the Chief Compliance Officer of China Animal Husbandry Group since 2013.

He has wide management experience and deep knowledge in international business culture.

Mr. Zhang holds bachelor’s Degrees in Economic Laws from Peking University.

Management Team

Bernard May

Chief Executive Officer

35 years of experience in the food and beverage industry.

New Zealand Institute of Directors – Certificate in Company Direction (2011).
New Zealand Certificate in Food Technology, Auckland Institute of Technology (1992).
New Zealand Certificate of Quality Assurance, New Zealand Quality Assurance Authority (1989)

Aidan Johnstone

Chief Financial Officer

42 years Accounting experience with 30 years in dairy manufacturing businesses.

Cost and Management Accountant (1987).
Chartered Accountant (1981).
Bachelor of Commerce (Accounting) University of Canterbury (1981)

Sonia Morrison

Head of People & Culture

Sonia has 25 years of experience in the travel industry and has previously owned & operated her own travel business in Gore.

Sonia’s focus is on people, relationship management, processes and procedures.

She is involved in a number of the local community and charitable activities and was a founding member of the Gore Kids Hub Charitable Trust.

Steve Smith

GM Quality & Compliance

30 + years in the Dairy Industry with over 10 years in quality management roles.

Diploma in Dairy Technology, Massey University (1988).

Mark O’Connor

Milk Supply Manager

Chris Houston

GM Sales

Chris has been working either within the dairy sector in a supplier context with sales and marketing roles at both Amcor and Carter Holt Harvey Corrugated Packaging but more recently for the last 4.5 years at Synlait Milk as a Commercial Manager. His early career was in dairy production after completing a Dairy Diploma in Dairy Technology.

Chris has relevant Nutritionals sales and in-market business development experience. He and his family live in Christchurch. He is very excited to be joining the Mataura Valley Milk team.

Paddy McMyler

GM Operations