Siegfried Rosengart

Siegfried Rosengart (1894 – 1985) was a German-Swiss art dealer.

Early life Rosengart was born in 1894. His parents were Heinrich Rosengart (1850–1921), a bed feather maker, and Selma Thannhauser. His uncles, Joseph Rosengart and Heinrich Thannhauser, were both involved in art.

In 1912 Rosengart was influenced by a visit to the Sonderbund exhibition in Cologne in 1912, which featured modern art. He met Picasso while studying French in Paris in 1913–14. In 1919, Rosengart joined his uncle Heinrich Thannhauser's gallery. Rosengart opened a branch for Thannhauser in Lucerne in 1920, managing it until 1937. In 1933 he received Swiss citizenship. joined him in running the gallery in 1948, becoming a partner in 1957.

He acted as an advisor and intermediary for Bernhard Sprengel (1899–1985) and Peter Ludwig (1925–96).