Ronan began independent design work immediately after completing his studies, while his brother, who was still in school, assisted him.

Since 1999 both brothers have worked together as joint partners in their own Paris-based design studio. Their work ranges from small utilitarian objects to architectural projects. In addition to the design of domestic and office furniture, vases, porcelain dishware, jewellery and diverse home accessories, a primary focus of their work is the design and organisation of interior space.