Theyskens’ Theory made its debut in Spring 2011 as an capsule concept for Theory women’s collection; Theory itself was founded by Andrew Rosen in 1997. The Theyskens' Theory collection is the namesake of its creator, Belgian fashion designer Olivier Theyskens, with a premise to approach fashion from the perspectives of accessibility and versatility. Previously Theyskens had achieved critical acclaim from fashion commentators for his work on his own label and as creative director at several major houses. Theyskens began his career studying at fashion design at École Nationale Supérieure des Arts Visuels de la Cambre, leaving in 1997 aged 21 to found his own label. Theyskens attracted press attention when Madonna wore one of his dresses to the Academy Awards in 1998, and presented as part of Paris' ready-to-wear schedule until Spring/Summer 2002. After folding his own label, Theyskens was appointed creative director at Rochas, drawing on the history of the house's founder Marcel Rochas to resurrect a couture-tinged vision of femininity that was enormously influential. In 2006 Theyskens was appointed artistic director at Nina Ricci, where he designed for three years. He left Ricci in 2009, having developed a dedicated band of fans and significant critical praise for his design skills and his general approach to fashion, which rejected the capitalist nature of the industry. After the success of the initial Theyksken's Theory collection in Spring 2011 Theyskens was formally appointed as Artistic Director of Theory, overseeing men’s, women’s and accessories in addition to the Theyskens' Theory label.
- Theyskens' Theory presents a live stream.