After studying science in France, Denis Flageollet trained as a watchmaker and micro-mechanic in Switzerland. He worked with Michel Parmigiani, before founding with François-Paul Journe the THA company, supplier of exceptional products. In 2002, together with David Zanetta, he launched the De Bethune project, whose Manufacture is located in L’Auberson, in the Jura vaudois region. His work has won several national and international awards.