After freedom in 1944 Friedlaender began a series of twelve etchings entitled Images du Malheur with Sagile as his publisher. In the same year he received a commission to illustrate four books by Freres Tharaud of the French Academy. In 1945 he performed work for several newspapers including Cavalcade and Carrefour. In the year 1947 he produced the work Reves Cosmiques and in that same year he became a member of the Salon de Mai, which position he held until 1969. In the year 1948 he began a friendship with the painter Nicolas de Staël and held his first exhibition in Copenhagen at Galerie Birch. The following year he showed for the first time in Galerie La Hune in Paris. After living in Paris for 13 years, Friedlaender became a French citizen in 1950.
Friedlaender expanded his geographic scope in 1951 and exhibited in Tokyo in a modern art show. In the same year he was a participant in the XI Trienale in Milan, Italy. By 1953 he had produced works for a one-man show at the Museum of Neuchâtel and exhibited at the Galerie Moers in Amsterdam, the II Camino Gallery in Rome, in São Paulo, Brazil and in Paris. He was a participant of the French Italian Art Conference in Turin, Italy that same year.
From his atelier in Paris Friedlaender instructed younger artists who themselves went on to become noteworthy, among them Arthur Luiz Piza, Brigitte Coudrain, Rene Carcan, Andreas Nottebohm, and Graciela Rodo Boulanger. Like Friedlaender, these students were expert in the lithographic and etching arts. He also taught printmaker Martha Zelt.
1978 brought a retrospective of Friedlaender's works at the Musee d’Art Moderne de la Ville de Paris. He was awarded the Lovis Corinth Prize in Regensburg three years later. On his 75th birthday, Friedlaender was given a retrospective in the Bremen Art Museum. On his 80th birthday a retrospective exhibition was held in Bonn, Germany at the municipal council offices. Friedlaender died in Paris at the age of 80.Wikipedia