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Marquis Marketing Board

We have been using our collective ingenuity to develop a world class approach to farm management and processing since 1983, and along the way we’ve become the world’s largest macadamia grower, processor and marketer. Our skilled and experienced Board and executives, along with our highly trained and passionate staff, are always available to provide support and advice for our growers and customers.

Board of Directors – Marquis Marketing

Peter Costi REV

Peter Costi

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Walter Giuricich

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Shane Hartman


Andrea Lemmon

Andrew REV

Andrew Leslie

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Roelof van Rooyen

Donald Keith Ross_ photoshopped web

Donald Ross

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Francois Vos

Peter Zadro REV

Peter Zadro

Phil REV

Phil Zadro


About Peter Costi

Peter has extensive experience in all facets of the macadamia industry. He is the owner of one of Australia’s largest macadamia farms located at Baffle Creek in Queensland. He has successfully expanded operations stretching from Rockhampton to the Sunshine Coast, including a large holding at Bauple, the original home of the macadamia nut.  Peter has been a shareholder in MPC since 1999, PGM since 2015 and became a Director of MPC (now Marquis Macadamias), PGM and MMI in 2015. 

Peter’s previous roles include Director and Shareholder of a large commercial construction company located in Sydney, New South Wales. He was also a Director, Shareholder and key contributor to the establishment and roll-out of a large successful residential building company. 

About Walter Giuricich

Walter grew up in Johannesburg and joined the family business, Kudu & Esperia Farms’ which had diversified into macadamias in the late ’90s. During this time he had the opportunity to oversee Ivory Macadamias processing plant (established on the property in 2008) and which was seeing unprecedented growth. During this period he was appointed Director of SAMAC (Southern African Macadamias Growers Association) and held the position of Chairman from 2016 to 2018. Walter oversaw the processing and procurement operations at Ivory Macadamias until 2015 whereafter he became more involved in the family farming operations primarily focusing on macadamia orchard developments, infrastructure construction and joint ventures with private investors and local communities within the Lows Creek area. 

Walter has a Bachelor of Farm Management.

About Shane Hartman

Shane grew up in Limpopo, South Africa, in a small mining and agricultural town. Having always had a passion for numbers he spent a lot of time with the accounts personnel in the family owned business and even processed the accounting records from an early age.

Shane completed a BCompt Acc (Hons) degree from the University of Potchefstroom. This was followed by a Masters in Tax (MTax) from the University of South Africa and then a Masters of Business Administration (MBA) from Regent Business School.

About Andrea Lemmon

Andrea has spent most of her career in the agriculture industry having worked at Rural Funds Management, Perth Markets Ltd and Market City Operator. During her extensive time with Rural Funds Management, her role included a variety of senior executive corporate roles and she was responsible for overseeing large investments into the macadamia industry, such investments included acquiring 250ha of orchards over three sites in the Bundaberg Queensland region.

During Andrea’s previous role as Director of Perth Markets Ltd and Market City Operator she oversaw Perth’s only wholesale fruit and vegetable market with $700m of throughput, representing approximately 60% of WA’s fresh fruit and vegetables, linking 2,600 growers with 600 buyers.

About Andrew Leslie

Andrew has extensive background in the macadamia industry and as a grower himself having several farms around the Alstonville NSW region. Andrew is founder and operator of the successful ‘Avilla Farm’ – a natural skincare range featuring Australian macadamia oil as the key ingredient

Andrew has a Bachelor of Economics and a Post Graduate Diploma in Financial Management.

About Roelof van Rooyen

Roelof is a shareholder and Director of one of the largest commercial macadamia farming operations in South Africa. He has extensive knowledge within the industry having served on the boards of numerous macadamia processing facilities and macadamia farming operations over the past 11 years. Roelof and his families’ farming operations span across numerous growing regions within Mpumalanga, South Africa.

Roelof’s passion lies especially in the planning, design and implementation of Macadamia processing and marketing facilities. He successfully ran and more recently formed part of the design and implementation team of Global Macadamias, one of the largest processing facilities in the world, in which he is also a shareholder and Board member. Roelof has a Bachelor of Engineering and an MBA.

About Donald Ross

Donald has over 30 years’ experience in the macadamia industry after developing several farms in the northern rivers of NSW and also the Bundaberg, Queensland region. Donald’s previous roles include Managing Director and Chief Executive Officer for large public and private companies. He has a Bachelor of Engineering from Sydney University and MBA, Master of Commercial Law and PhD from Macquarie University.

About Francois Vos

Francois’s experience as CEO of AP Vos & Sons has given him the opportunity to successfully head up the macadamia and ginger divisions which exports globally around 1,000 tonnes per season. He is a fourth generation farmer and was the founder and Director of a large transport and logistics company.

Francois has studied Financial Information Systems at Cape Town University of Technology.

About Peter Zadro

Peter’s previous roles include working for multinational telco provider, Alcatel this role took him into various European and Australia offices as a programmer and project manager. Peter has a rich family history of farming in NSW with his introduction into macadamia orchards in the late 1970s. Peter has a degree (Honours) in agriculture and assisted the Department of Agriculture with the wheat and oat breeding programmes in Temora NSW.

About Phil Zadro

Phil is the founder of Saratoga Holdings Pty Ltd, the single largest successful producer of macadamias globally. His highly successful growth strategies have seen his orchards grow and spread across the eastern coast of Australia from northern NSW to Central Queensland and internationally into South Africa. In 1983 Phil built a macadamia processing factory in Lismore NSW, and formed a new company of growers and named it MPC, now known as Marquis Macadamias. Phil has been instrumental in shaping the macadamia industry to what it is today.

Phil’s previous roles include founder and Director of a number of hugely successful construction companies in Sydney NSW.