Religious Zionist leader and philosopher. Born to a Hasidic family in Poland, he rose at an early age to a high position of leadership in religious Zionism. He worked untiringly for Hapoel Ha­mizrachi, as well as for Hehalutz and Zionist fundraising, at first in Poland and later in 1925 in Palestine. Landau was the founder of the move­ment within religious Zionism that stressed Torah Ve-Avodah, or traditional Judaism and labor.