Stylistically, he is close to painters such as Alberto Magnelli, Jean Deyrolle, Michel Seuphor, Emile Gilioli and Aurélie Nemours.
[2] From 1929 to 1930, Leppien studied at the Bauhaus Dessau, where he attended the preliminary course of Josef Albers and the painting classes of Wassily Kandinsky and Paul Klee.
[3] From 1931 to 1933, he studied photography at the Itten School in Berlin with Lucia Moholy and worked with László Moholy-Nagy (International Building Exhibition 1931).
To earn his living, he worked on applied graphic (book covers), photomontages, exhibition design ("le grand Garches") and photo coverage.
Fearing discovery by the Gestapo, Jean and Suzanne Leppien led a secluded life in Sorgues near Avignon from 1940 to 1944 and survived as vegetable farmers on a small piece of land.
[4] For Leppien, the restart in post-war France was the actual beginning of his artistic development, which was nevertheless based on his short period of study at the Dessau Bauhaus.
André Bloc, Heinrich Maria Davringhausen, Jean Deyrolle, Adolf Fleischmann, Richard Mortensen, Serge Poliakoff, Hans Reichel, Michel Seuphor, Pierre Soulages, Victor Vasarely) and the critic Herta Wescher.