61^st American Exhibition, Art Institute, Chicago
Work in Progress - Paintings by Lee Milliken and Mark Tobey, Detroit Institute of Arts
1955
Annual Exhibition, Whitney Museum of American Art, New York
Tendences actuelles, Kunsthalle Bern; Kunstmuseum Basel, Switzerland (with Pollock, Matthieu, Michaux, Riopelle, Trancredi and Wols)
Exhibition of Contemporary American Painting, University of Illinois, Urbana
Galerie Stadler, Paris, France
Pittsburgh International Exhibition of Contemporary Painting, Carnegie Institute, Pittsburgh
Cinquante ans d’art aux Etats-Unis, Musée National d’Art Moderne, Paris, France
41^st Annual Exhibition of Northwest Artists, Seattle Art Museum
1955/56
Annual Exhibition, Whitney Museum of American Art, New York
1956
Manessier, Singler, Poliakoff, Tobey, Vieira da Silva, Galerie d'Art Moderne, Basel, Switzerland
Japanische Kalligraphie und Westliche Zeichen, Kunsthalle Basel, Switzerland
Contemporary Calligraphers - John Marin, Mark Tobey, Morris Graves, Contemporary Arts Museum, Houston
Annual Exhibition, Whitney Museum of American Art, New York
Pictures collected by Yale Alumni, Yale University, New Haven
Exhibition of Works by newly elected Members of the National Institute of Arts and Letters, American Academy of Arts and Letters, New York
Structures en Devenir, Galerie Stadler, Paris, France
Modern Masters, Rose Fried Gallery, New York
42^nd Annual Exhibition of Northwest Artists, Seattle Art Museum
Moderne Kunst aus USA. Aus den Sammlungen des MoMa, New York, Wiener Secession, Vienna, Austria