Didier Chevalier, who has worked for Krys Group and its predecessor, Guildinvest, for 21 years, has been promoted to be general manager of the French optical retail group, where he was most recently in charge of network operations. The 56-year-old manager takes the place of Arnaud Ploix, who ran the group for only a year and a half, after Antoine de Roffignac. Krys got a new president last March, Christophe Lemesle, replacing Bertrand Désir.