In 1938 Stephen received his doctorate in law. From 1941 he was active in giving assistance especially to refugees from Poland. From 1942 he was the representative of “Hatzionim Haclali’im” at the Relief and Rescue Committee. After 19.3.1944, he became the leader of “Hanoar Hatzioni”. Stephen was among the organizers of the tiyul and, as a result, was arrested, incarcerated in the prison on Fø Street and later in the Kistarcsa detention camp. He was liberated thanks to Ottó Komoly, the president of the Hugarian Zionist Association. After the Arrow Cross Party rose to power on 15.10.1944 Stephen was active in the branches of the Swiss consulate on Wekerle and Vadász Streets. After the liberation he was the manager of the information center on the persecution of Jews in Hungary on behalf of the World Jewish Congress. Stephen arrived in London and worked with Dr. Nahum Goldman. For four years he was the president of the British Zionist Organization.