In the fifties Gubbels followed several courses. He studied from 1949 to 1951 at the Technical School in Rotterdam, a program for advertisement painting, from 1951 to 1952, an evening course at the Academy of Fine Arts in Rotterdam and studied from 1952 to 1958 at the academy '' Kunstoefening 'in Arnhem and in addition he also followed evening classes at the 'beeldhouwkunde' department. In the seventies was Klaas Gubbels connected to the Willem de Kooning Academy in Rotterdam, together with other painters and printmakers like Hannes Postma. In late 2004 / early 2005, Klaas Gubbels had an giant retrospective exhibition of his work at The Museum of Modern Art Arnhem.
At the Course of Time Rossen, the artworks of Klaas Gubbels become more abstract. It remains to be seen primarily as timid (reticent), because of the limited number of visual themes. But this is also the power and charm of his art. In addition he uses a variety of techniques and materials-including photography, lithograph, woodcutting, mural, collage, found objects, glass and metal. His work has iconnections with works of artists like Giorgio Morandi and Amedeo Modigliani and seems influenced by Marcel Duchamp, Man Ray and George Segal. His work is represented in several major Dutch museums and Commercial Collections like Ahold, Akzo and TNT.