Mordehai went to elementary school and the Jewish high school in Bratislava. In 1941 due to the anti-Semitic decrees he had to interrupt his studies. He joined “Hashomer Hatzair” at the age of ten. In 1942 Mordehai crossed the border into Hungary, was caught and returned to Slovakia. In December of the same year he again tried to reach Hungary but was caught again and imprisoned. This time he was not returned to Slovakia. He was released in the spring of 1943 and became active in the movement that operated underground in Hungary.
One day after the Germans invaded Hungary on 19.3.1944, Mordehai was told to save the contents of the movement’s ken on József Boulevard in Budapest. On 14.4.1944 he was caught again and sent to different detention and forced labor camps. After the Szálasi coup on 15.10.1944 Mordehai escaped and met Moshe Alpan who took him into the underground activities. Among other things Mordehai escorted delivery carts to the ghetto, children’s houses and other places.
After the liberation he worked as a translator in Russian and was the instructor of groups of children and youngsters. Mordehai took part in the revival of the movement.
In April 1946 he made aliya on the “Max Nordau” (Smirna) ship which was intercepted by the British and whose passengers were imprisoned in Atlit (Palestine). After his release from the camp, Mordehai stayed for a year in Kibbutz Ma’anit. The garin he was a member of founded Kibbutz Yassur. In the fall on 1947 he volunteered to an infantry unit of the Hagana, escorted convoys and was wounded. After his convalescence, he resumed his military service and took part in many battles. In 1951 he married Trudi.
The family left the kibbutz in 1952. Mordehai was an interior designer and lived in Givatayim.