Yitzhak was born on February 4,1913, in Kalish Poland. Father Shlomo owned a large metal workshop. His mother Tzviya raised four sons. He studied in elementary school and worked with his father. Aged 14, he joined Beitar, trained in boxing and represented Beitar at competitions. He came to Eretz-Yisrael 1932 for the first ‘Maccabiya’ Games then remained illegally, employed as a metalworker. In 1933 he married Yehudit (Ida) Glicker. Eldest son Giora was born 1935. Yitzhak joined Etzel and participated in the 1939 Mishmar-Hayarden weapons course; all 38 participants were arrested, sentenced to 10 years at Akko Prison and later Mizra. He obtained an early release 1942. Following the Etzel split 1940, he joined Lehi, serving in various positions. Preparing explosives for sabotage operations, he suffered severe burns when material exploded prematurely in his hands. He was hospitalized in Ramat-Gan. Second son Amikam was born November 1,1943, the very day twenty Latrun prisoners escaped through a tunnel. Amikam was killed in the Yom-Kippur War. He is survived by his wife and two children. Yitzhak moved close to Bnei-Brak 1945, and built a bunker at his home, to hide escaped prisoners and weapons. Dr. Yisrael Eldad hid there after escaping prison in Jerusalem. Yitzhak ran the Lehi factory manufacturing Sten sub-machine guns, and participated in the assassination attempt upon the British military governor of Tel-Aviv, by laying road-mines. Upon establishment of the State he joined the IDF. Following the assassination of Count Bernadotte, he was arrested and jailed at Jaffa, later Akko. After the War of Independence he developed his private business. In 1960 he built a new factory at Tel Aviv industrial zone. In 1970, another large, modern, metal processing plant was built in Holon. After his son’s death, he shut the factory, moved with his wife to a retirement home, dedicating himself wholeheartedly to creating settlements in Judea and Samaria. He sculpted as a hobby. Yitzhak passed away on February 22, 1995. He was buried in the Lehi section Yarkon Cemetery. Yitzhak is survived by his wife and son, five grandchildren and six great-grandchildren.