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Marquis Macadamias Australia 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 Macadamias


Andrea Lemmon

Peter Costi REV

Peter Costi

Andrew REV

Andrew Leslie

Clayton REV

Clayton Mattiazzi

Donald Keith Ross_ photoshopped web

Donald Ross

Peter Zadro REV

Peter Zadro

Phil REV

Phil Zadro


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 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 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 Clayton Mattiazzi

Clayton has over 13 years experience in the macadamia sector having spent the past 13 years at Hinkler Park Plantation in Bundaberg, Queensland. During his career at Hinkler Park, Clayton has gained valuable knowledge and experience in all aspects of macadamia production including nursery management, farm development, orchard management and post-harvest handling. Clayton has a Degree in Agronomy.

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 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.