Founded in 1786, Keller & Guérin was a faience manufacturer based in Luneville, near Nancy. By the 1880s Keller et Guérin, successfully produced an eclectic mixture of barbotines and earthenwares with painted or printed decorations. During the Art Nouveau period, the firm's output was informed by the organic work of the school of Nancy. Famous ceramists, including Edmond Lachenal and Ernest Bussière, were commissioned to create new designs using stoneware clay and luster glazes. The firm's mark is pictured.