Ephraim Katzir (; – 30 May 2009) was an Israeli biophysicist and Labor Party politician. He was the fourth President of Israel from 1973 until 1978. Biography Efraim Katchalski (later Katzir) was the son of Yudel-Gersh (Yehuda) and Tzilya Katchalski, in Kiev, in the Russian Empire (today in Ukraine). In 1925 (several publications cite 1922), he immigrated to Mandatory Palestine with his family to escape Soviet terror by the newly-elected Joseph Stalin and settled in Jerusalem. In 1932, he graduated from Gymnasia Rehavia. A fellow classmate, Shulamit Laskov, remembers him as the "shining star" of the grade level. He was “an especially tall young man, a little pudgy, whose goodness of heart was splashed across his smiling face.” He excelled in all areas, “even in drawing and in gymnastics, where he was no slouch. He was the first in the class in arithmetic, and later on in mathematics. No one came close to him.” Like his elder brother, Aharon, Katzir was interested in science. He studied botany, zoology, chemistry and bacteriology at the Hebrew University of Jerusalem. In 1938 he received an MSc, and in 1941 he received a PhD degree. In 1939, he graduated from the first Haganah officers course, and became commander of the student unit in the field forces ('Hish). He and his brother worked on the development of new methods of warfare. In late 1947, after the outbreak of the 1948 Palestine war, and in anticipation of the War for Israel’s Independence, Katzir met the biochemist David Rittenberg, then working at Columbia University, stating:’ ‘I need germs and poisons for the [impending/ongoing Israeli] war of independence,’ Rittenberg referred the matter to Chaim Weizmann. Weizmann initially dismissed the request, branding Katzir a ‘savage’ and requested his dismissal from the Sieff Scientific Institute in Rehovot, but weeks later he relented, and his dismissal was rescinded. Shortly afterwards, in March 1948, his brother Aharon, who decades later was one of the victims of the Lod Airport Massacre, was appointed director of a research unit, HEMED, in Mandatory Palestine involving biological warfare. A decision to use such material against Palestinians was then taken in early April. In May Ben-Gurion appointed Ephraim to replace his brother as director of HEMED, given his success abroad in procuring biological warfare materials and equipment to produce them. Katzir was married to Nina (née Gottlieb), born in Poland, who died in 1986. As an English