 According to Barrington-Coupe, he survived the Warsaw Ghetto but in the summer of 1942 was deported to Treblinka concentration camp which he survived one of fewer than a hundred to do so.From 1945 to 1970, Barrington-Coupe claimed, Köhler was a prisoner in the Soviet Union.Barrington-Coupe issued several recordings of piano music which, he claimed, featured Hatto as the pianist.