[3] Initially the Judenrat's head of retraining, Neumann used his position to help the country's Zionist youth movement, according to Yehuda Bauer.
[6] In April 1944 Neumann was one of the Judenrat leaders who interviewed Rudolf Vrba and Alfred Wetzler, Slovakian Jews who escaped to Bratislava from the Auschwitz concentration camp in occupied Poland.
[9] Neumann was the author of a postwar memoir, Im Schatten des Todes: Ein Tatsachenbericht vom Schicksalskampf des slovakischen Judentums ("In the shadow of death: A report on Slovakian Jewry's battle with fate"), which was published in German and Hebrew in Israel in 1956.
He dedicated the book to his mother, Friederike Neumann; his in-laws, Isidor and Julie Knoepfelmacher; Gisi Fleischmann, leader of the Bratislava Working Group; and the 70,000 martyrs of Slovakian Jewry who died in the camps and gas chambers.
In Israel, a publisher in Tel Aviv had in his possession a memoir, four hundred pages long, written by Oskar Neumann.