Albert EINSTEIN (1879-1955). L.S., Princeton May 9, 1939, to Erwin Piscator; half page in-4 on his letterhead; in German. To the great German director Piscator (1893-1966), he sends a letter in the hope that it will help ease his way: "sende ich ein Schreiben von den gewünschten Art in der Hoffnung, dass es zur Ebnung Ihres Weges beitrage"... Attached are 3 duplicate typewritten letters: Piscator to Einstein, Einstein's attestation...