Historical Who is Who » BAECK, Leo
Berlin Rabbi, then army chaplain during WW1. From 1933 political leader of German Jewry, refusing to leave till deported to Theresienstadt concentration camp for 3 years till 1945. Resettled in London - chair of World Union of Progressive Judaism. Wrote extensively, propounding morality as the core of being Jewish - active response to divine commands.
Judaism and Christianity http://www.questia.com/library/82233370/judaism-and-christianity
Leo Baeck - 'Between heaven and Earth' (4 mins) https://www.youtube.com/watch?v=8DbNrSpZ_Zo