Two years later, in 1897 he attended the First Zionist Congress in Basel, Switzerland. Afterwards he began teaching in Berlin from 1905 to 1914. Later, during the First World War, he relocated to Madrid where he was appointed in 1915, by royal decree, chair of rabbinic languages and literature[3] After a fall-out with Chaim Weizmann over Zionist attitudes to Arabs, he joined Zeev Jabotinsky's Revisionist Zionist Movement, and was thereafter actively sponsored by the latter.[3] Eventually Yahuda would relocate once again to New York and continue his career at the New School for Social Research.