the wine network team

Founded in 1994, WNC brings decades of winemaking, viticulture and business experience to its projects around Australia and the world. From its original base in Hawthorn, to today’s office in the heart of the Yarra Valley WNC has always held a forward-looking, global view of the wine world.

Its projects continue to take the team far and wide, and have included locations as diverse as China, India, England, Japan, New Zealand, Vietnam, Turkey and Thailand.

Each member of the Wine Network Team is a highly respected professional with extensive experience in their selected field, making Wine Networking Consulting one of the most recognised, regarded, and valuable resources for the Wine Industry both in Australia, and internationally.



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Mark O’Callaghan



Mark joined WNC as a Director and Consultant in 2013 after working as a Senior Winemaker for one of the largest Australian wine companies. He works with wine businesses across Australia and around the world including China and England, with earlier projects in India and the Canary Islands.


Gary Baldwin



With university qualifications in biochemistry and wine science and many years experience in senior winemaking and management roles, wine-show judging, wine research and extension, Gary is one of Australia’s most respected wine professionals.


Steve Flamsteed



One of Australia’s most successful winemakers, Steve’s first career was in food, working as a chef and cheesemaker. Later he worked across France, was winemaker at Leeuwin Estate (Margaret River) and Yarra Burn (Yarra Valley) before joining Giant Steps in 2003. He is a Len Evans Tutorial Scholar and experienced wine show judge. In 2016 he was awarded the Australian Gourmet Traveller Magazine Winemaker of the Year award and in 2019 was announced as Wine Communicators Victorian Legend of the Vine.


Mavis Zhang



With a Bachelor of Viticulture and Oenology from the University of Adelaide, Mavis Zhang is one of the leaders of the emerging generation of Chinese-born wine professionals. Today she brings more than five years of professional production experience with top-flight producers such as Bass Phillip and Vasse Felix, along with Rob Dolan and Sunshine Creek in the Yarra Valley.


Sandrine Gimon



Raised in Savoie, France, but now based in the Yarra Valley, Sandrine is the former Chief Winemaker for Rymill, Coonawarra. Sandrine is an active wine show judge, has completed the Len Evans Tutorial (2017), the AWRI’s Advanced Wine Assessment Course (2007) and enjoys sharing knowledge and critical thinking with clients.


Conrad Speight


A Mechanical Engineer by profession, Conrad has over 20 years of experience in winery development, upgrades, relocations and detailed project management. He is one of the most experienced Winery Engineers in Australia. Based in Adelaide, his recent projects include major upgrades to a 75,000 Tonne winery in Mildura and a high-end boutique winery in the Yarra Valley. As the former National Engineering Manager for Accolade wines (previously BRL Hardy) Conrad has developed and managed winery building projects in Canberra, the Clare Valley, Yarra Valley, Riverland, McLaren Vale, Margaret River, Swan Valley and Tasmania. Internationally, he was also responsible for a winery in Chile and has toured extensively, giving him a very broad industry understanding. Prior to specialising in the wine industry, Conrad spent 12 years in manufacturing and construction in the mining, food production and car sectors.

Ray Guerin

Ray Guerin is a veteran with enormous cool climate experience. He was awarded Gourmet Traveller Wine magazine’s Viticulturist of the Year in 2013 and inducted into the Yarra Valley Hall of Fame in 2018.Ray worked with Hardy’s for 18 years, specialising in southern Victoria and Tasmania, with particular influence on Hardy’s Arras sparkling wines – where he worked with chief sparkling winemaker Ed Carr. Ray then joined Shaw & Smith as Group Viticulturist in 2011. Early in his career, Ray left his family’s vineyards in McLaren Vale and moved to the Yarra Valley to establish Hoddles Creek vineyard. Much later, Ray established his own Yarra Valley vineyard, Applejack.

Nicole Esdaile


Nicole been associated with WNC since 2009; is a qualified pharmacist & winemaker; and has extensive production, strategic, operational and business management experience. Nicole has been broadly involved in the Australian Wine Industry for almost 20 years, holding senior winemaking & management positions at Capel Vale wines in WA, Rutherglen Estates in Rutherglen, Victoria and most recently Coombe Farm in the Yarra Valley. She is an experienced wine show judge and sits on several Wine Industry Boards & Committees.

Peter Hayes AM


Mr Peter Hayes has extensive experience across education and training, R&D investment and management, viticultural operations, irrigation sector and government and industry affairs in a 30+ year career in the wine industry. Mr Hayes is a society ‘fellow’ of the ASVO, a title given to members who have made a particularly outstanding and meritorious contribution to the grape and wine industry. The criteria for this award include making a major contribution in an industry, scientific, educational or Society role and having been a member of the Society for at least 10 years.

Dr David Jordan


Dr David Jordan is a Viticultural Scientist. He has a Doctorate (PhD) in Viticulture from Oregon State University, USA and an Honours degree in Horticultural Science from Lincoln University, New Zealand. He has developed significant commercial experience during his involvement in the international grape and wine industry since 1983, and established his consultancy business Vine to Wine to Market in 1994. Based in New Zealand, David consults to many wineries, vineyards and wine businesses in Australia and internationally.