Guillaume's passion for wine was born at a young age when his father (who had exposure to the world of wine through the aviation industry) taught him that wine is something that can be an everyday enjoyment, not just reserved for special occasions.
Guillaume's love for nature and diversity played a big part in the decision to study B.Sc. Agriculture (Oenology & Viticulture) and after qualifying at Stellenbosch University as Winemaker and Viticulturist, his first vintage as a student was during 2000 at the world renowned Kanonkop Wine Estate under the guidance of Beyers Truter (now owner of Beyerskloof Wine Estate).
In 2001 Guillaume was appointed as assistant winemaker at Amani, also in Stellenbosch. Shortly hereafter he had the opportunity to travel and work vintages in some of the finest wine regions in the world.
First up was Fattoria Terreno in Chianti Classico, Tuscany. Here Guillaume worked with Federico Staderini who was a former winemaker for Antinori and who are now consulting for some of the most well known estates in Italy and other parts of Europe.
This was followed by a harvest at St Halletts in the Barossa Valley in South Australia where some of the best new world Shiraz is made.
His next harvest was at Chateau Montelena in California. Famous for their Chardonnay that won the blind tasting against top Burgundies in 1976 referred to as the "Judgement of Paris".
In Dec 2002 he was appointed as Winemaker and Viticulturist at Muratie Wine Estate in Stellenbosch and in October 2005 Guillaume was appointed as winemaker and viticulturist at The Winery of Good Hope. During South Africa's off-season he worked another vintage at Maison Alain Paret in the Rhone Valley.
In October 2007 he was offered the position of winemaker at Backsberg Estate Cellars in Paarl and it was here that he was the first winemaker in South Africa to bottle premium certified wine in PET. He is also one of the first to move from heavy weight to light weight bottles, which have a smaller impact on the environment.
During June 2012 he joined the Cavalli team as winemaker and viticulturist until September 2014.
From October 2014 until October 2017 he was appointed as General Manager and Winemaker at Aaldering Vineyards & Wines in Devon Valley where he introduced precision viticulture and made great improvements to the vineyards. His wines also won many accolades internationally including listings on major airline companies in First and Business class.
In October 2017 he joined the team of L'Olivier Wine and Olive Estate as Winemaker and Viticulturist where he is striving to understand the terroir as best as possible to manage every vineyard according to its needs.
His philosophy is that great wine is the manifestation of carefully managed vineyards and that wine should clearly communicate the context of the grapes. The use of oak and other winemaking practices should only be tools to augment the naturally occurring attributes of the wine and not dominate or mask the wine's delicate personalities.