Career
Frenkel was a Privy Commercial Councillor (Geheimer Kommerzienrat), and one of the founders of Universum Film AG. Frenkel was also a noted art collector, who concentrated on German, French, and Spanish 19th-century paintings, as well as Dutch 17th-century and Venetian 18th-century works. His heirs sold most of the collection in October 1932. Some works werde not sold, among them a stillife by Snyders, which is today in Museum Kunstpalast in Düsseldorf, which was bought in 1938.