From 1894 to 1900, he traveled to Tunisia, Sicily, Egypt, Persia, and Ceylon, during which time he produced numerous notebooks that included drawings, watercolors, and photographs. He had already worked in the studio of his father, Charles, André, then with Eugène Vallin, with whom he developed the principles of Art Nouveau.
He was slated to become a professor of applied arts and architecture with the École de Nancy, and is considered[by whom?] to be one of the group's principal architects. He built more than a dozen Art Nouveau buildings in Nancy between 1901 and 1912.