Thank you note for celebrating fifty years of working, from Arthur von Weinberg (1860-1943). Weinberg was a co-owner of Cassella and later a co-founder, co-owner, and member of the supervisory board and the administrative board of IG Farben. He founded the Arthur von Weinberg Foundation in 1909, was director of the Senckenberg Nature Research Society, and was a co-founder of the Goethe University Frankfurt in 1914.

A member of a prominent Jewish-origined family of industrialists, Arthur Weinberg received numerous honors in Germany. During the Nazi regime, Weinberg was forced out of his offices and for a time lived with his adopted daughters Marie and Charlotte, Countess Spreti in Bavaria. In 1942 he was arrested, and he died in the Theresienstadt Ghetto at the age of 82.