Monnier was an architect in Geneva and made various reliefs under the direction of Etienne Joukowski and Maurice Lugeon. He was also involved in the production of a relief (Pilatus) as part of the relief service of the army.

[1] This article bases on Mair, Toni. Grieder, Susanne. Das Landschaftsrelief – Symbiose von Wissenschaft und Kunsthandwerk. Mit Schweizer Reliefkatalog. Verlag hier+jetzt. Baden, Schweiz. 2006. S.164.