[1] A member of the Nazi party from before 1933, Griebert worked as an advisor for the Reich Chamber of Fine Arts in Berlin from 1934 to 1937.
When Nazi looted art was discovered in the vault of Lohse's Foundation Schonart, the only person authorized to access it was reportedly the younger Grieber.
Benno Griebert and his Meersburg Gallery in Lake Constance were a major source, which also involved Bruno Lohse, Adolf Weinmüller, Herbert Hoffmann and others.
[10] In 2011 the Landesmuseum Württemberg in Stuttgart, Germany restituted a 16th-century wooden sculpture of St. John the Baptist to the heirs of Jacob and Rosa Oppenheimer, who had been plundered by the Nazis because Jewish.
The Jean Paul Getty Museum which acquired the artwork after it was restituted, noted in the provenance that Nazis had auctioned the looted sculpture to Heinemann and Dr. B. Griesbert, after which it disappeared into anonymous private collections before arriving at the Landesmuseum Württenberg.