Since the seventies he has stayed regularly in Germany, participating in several exhibitions. He now lives in Munich and regularly shows at the Konrad Fischer Galerie Düsseldorf/Berlin, and at Annemarie Verna Zürich.
Zeniuk became known in the seventies, when he participated in the landmark Fundamental Painting exhibition in the Stedelijk Museum Amsterdam in 1975. Since then his paintings have developed from a monochrome plane, in which several coloured layers have been superimposed, towards compositions of juxtaposed contrasting colour planes.
From 1992 to 2010 he taught at the Akademie der Bildende Künste Munich.
In recent years an exhibition of his work opened in Museum Augsburg. In 2013/2014 an exhibition was planned in Museum Wiesbaden, and many other relevant institutions such as Augsburg Museum, Wiesbaden Museum, Kunstmuseum Bonn, Brema Kunsthalle, Amburg Kunsthalle, Louisiana Museum, Staatliche Museen Humlebaek, Neue Galerie, Kassel Pfalzgalerie, Kaiserslautern Museum Ludwig, the Bayerische Staatsgemäldesammlungen Cologne, Städtische Galerie in the Lenbachhaus Munich, Sammlung Niedersächsische Sparkassenstiftung in the same city, the Virginia Museum of Fine Arts in Richmond and the Maslow Collection in Shaverton have exhibited his works.