He was born in 1903 in Masmünster , Alsace . After graduating from high school in Baden-Baden (1921), he studied psychology , philosophy , medicine , languages and art studies at the universities in Heidelberg , Leipzig , Berlin and Würzburg from 1921 to 1925 . In 1925 he received his doctorate in Frankfurt in the subject of psychology  and was there at the Psychological Institute assistant to Max Wertheimer , the founder of Gestalt theory . From 1933 he studied in Berlin Painting by the Swiss painter and art teacher Johannes Itten , whose assistant he became in 1933. In 1936 Kleint emigrated to Luxembourg .
Between 1936 and 1942 he traveled from there to Walter Gropius in London and to Kandinsky and Picasso in Paris , later a second trip to Kandinsky followed. After the liberation of the Grand Duchy by Allied troops (1944) he was interned in the Luxembourg state prison “Im Grund” for four weeks.
In 1946 Kleint received an appointment at the State School for Art and Crafts in Saarbrücken, where he took over the master class for painting and at the same time set up a “basic teaching” based on the Itten preliminary course ( Bauhaus ), which he passed on to his assistant Oskar Holweck after a few years passed on. In 1953 he took over the chairmanship of the Saarland Artists Association. In 1954 he was appointed professor and four years later a visiting professorship at the Technical University of Aachen . In 1957, Kleint and like-minded people founded the artists’ association “ neue gruppe saar ”. In 1969 his main work “Bildlehre” appeared, which became decisive for later generations of students and in several languages, including insJapanese , has been translated.
Kleint’s oeuvre covers a broad spectrum and is stylistically diverse. Both constructive – concrete elements and informal tendencies can be found in the work . According to his own statement, his artistic goal was a “visual universality” to which he subordinated the finding of a personal style.
In 1994 Klein received a Retrospective exhibition at the Josef Albers Museum. He signed a few of the exhibition posters of which one is now available at www.ftn-books.com