He was a German Jew who emigrated to Stockholm and then to Tel Aviv after WW2.With the help of Reichsführer Heinrich Himmler's osteopath, Felix Kersten, the Swedish section of the WJC arranged secret meetings in 1945 between Masur, Walter Schellenberg and Himmler about 70 kilometres north of Berlin.
"For me as a Jew, it was a deeply moving thought that in a few hours, I would be face to face with the man who was primarily responsible for the destruction of several million people," Masur later said.
Himmler told Masur, "I want to bury the hatchet between us and the Jews.
If I had had my own way, many things would have been done differently..." .As a result of this meeting and subsequent negotiations with the head of the Swedish Red Cross, Folke Bernadotte, the WJC was given custody of about 7,000 women from the women's Ravensbrück concentration camp.
Approximately half (45%) of these women (who had been deported from over 40 nations) were Jewish.
After their liberation they were housed in camps in southern Sweden.
Masur expressed his shock at the poor health of the women after several years of imprisonment in various camps.
His view was that return to their home countries was impossible for these women and that emigration to Israel was the only option open to these women in order for them to regain their dignity.