The French artist whose work was displayed in 1974 at Debel Gallery, was closely associated with the Viennese Actionism group, while Howard Zieff was an American television commercial director.
Rudolf Schwarzkogler (13 November 1940, Vienna  20 June 1969, Vienna) was an Austrian performance artist closely associated with the Viennese Actionism group that included artists Gnter Brus, Otto Mhl, and Hermann Nitsch. 
Howard B. Zieff (21 October 1927  22 February 2009), (pronounced Zeef ) was an American director, television commercial director, and advertising photographer. 
 In addition, the Gallery exhibited avant-garde artists, which was unusual for a private gallery; for example, in 1974 the Austrian artist Rudolf Schwarzkogler, and in 1976 the Gallery staged a performance of "Nidah" by Yocheved Weinfeld. 
