Lennier was the founder and president of the Geological Society of Normandy (SGN) and a founding member of the Friends of the Le Havre Museum. He served as the curator of the Museum of Natural History and Ethnography of Le Havre. Lennier was a non-resident member of the Archaeological and Historical Society of the Manche in 1857 and a member of the Grande Loge de France.LENNIER Gustave, cths.fr In 1862, Lennier was admitted to Société Havraise d’Etudes Diverses (Havraise Society of Diverse Studies, SHED), an academic learned society consisting of other individuals with literary, scientific and artistic merits.
