Pierre de Barrigue de Montvallon (12 November 1923 – 12 November 2020), known professionally as Piem, was a French designer. Piem was the son of Serge de Montvallon, director of the Maison de la chimie, and Madeleine Champavère. He was also the brother of Robert de Montvalon. On 22 August 1947, he married Élisabeth Lefebvre, who came from a family of industrialists from Roubaix. He had six children with Élisabeth (three sons, three daughters), including Thierry, who took the pseudonym Barrigue ...