Career
He was a cofounder of the Kulturbund Deutscher Juden. Bab was a close friend of journalist and theater critic Siegfried Jacobsohn and a key contributor to the early years of the magazine Schaubühne, the later Weltbühne. In 1939 he emigrated to the United States through France.
In 1951 he visited Germany in a lecture tour.
He died in Roslyn Heights, New York in 1955.