[5][6] Arnhold was a co-founder of the Society of Sponsors and Friends of the Dresden University of Technology (Gesellschaft der Förderer und Freunde der Technischen Hochschule Dresden, GFF) and was named its honorary senator for his long-standing commitment to the university.

[7] His wife Lisa, with the help of her brother-in-law Kurt Arnhold, managed to save the family and the porcelain collection, first to Switzerland and then via Portugal and Brazil to the USA.

[8] According to Artdaily, Arnhold acquired Emil Nolde's "Buchsbaumgarten" in the sale of the Ismar Littmann collection at the Berlin auction house Max Perl in February 1935.

[9] In 2000, the Lehmbruck Museum rejected a claim from the Littmann family, saying in the sale had taken place before the Nuremberg Laws were declared and the buyer (Arnhold) had been Jewish.

[10] In 2021, however, the museum reversed its earlier decision, acknowledging that Ismar Littmann, his widow and his four children were racially persecuted by National Socialist Germany after March 30,1933 due to their Jewish descent and therefore had to sell their art collection.

Since 2001, the son Henry Arnhold has facilitated a lecture and discussion series jointly organized with the American Academy in Berlin by Dresden Heritage e.V.