Rabbis Chaim Ozer Grodzinski and Chanoch Henoch Eigis warmly recommended his manuscript on Tractate Zevachim, which was lost during World War II.
The couple then left via Vilna for Palestine, where he met rabbis including the Brisker Rav, the Chazon Ish, the Steipler, Shlomo Zalman Auerbach and Yosef Shalom Elyashiv.
In 1947, he moved to the United States and from 1947 to 1953 served as Rosh Yeshiva at the Hebrew Theological College in Skokie, Illinois.
[citation needed] Kreiswirth became the Av Beth Din and Posek in Antwerp and was active in Agudath Israel.
Kreiswirth died on Sunday 30 December 2001 (16 Tevet 5762 on the Hebrew calendar) shortly before midnight, aged 82, after suffering from an illness.