After graduating from Roseworthy at the end of 1981, Ros returned home to Victoria to help establish and set up the Delatite winery. She was the winemaker for Delatite for the next 25 years, producing and growing the range of wines; these included the classic aromatics, method champenoise sparkling, as well as red varietals and blends. Many of these wines gained consistent critical acclaim both nationally and internationally, with 13 trophies, 39 Gold, 67 Silver and over 210 Bronze medals. In 2008, Ros established her own winemaking enterprise with an independent label. She has operated from Barwite Vineyards since 2014 where she is also the esteemed winemaker. Ros Ritchie wines are proudly to be a wholly local and Australian owned family wine business.