In 2000, artisan woodworker Thierry Lahay started thinking about making innovative objects out of wood and using cutout motif designs. In 2003, he launched Quésack: artistic essential-oil diffusers made in France with an ethical and environmentally-friendly approach. Fascinated by fragrances, he built up his now extensive knowledge by working with essential oil distillers. Guided by a deep sense of environmental and civic responsibility, he also seeks to preserve artisanal woodworking techniques.

In 2007, this adventure took a feminine turn with the arrival of glass artist Yolande Munier. Together, they developed a unique glass-molding procedure to enhance diffuser design.