There he had the chance to survive as a worker in a factory, which was founded in Mogilev by his uncle, Siegfried Sami Jagendorf (1885–1970), in order to save as many Jewish deportees as possible.

He was an active member of the Zionist students movement "Hasmonea", and left Romania in 1947 in order to emigrate illegally to Eretz Israel, then Mandatory Palestine.

The ship of Jewish refugees from Eastern Europe, "Pan York" (nicknamed in Hebrew "Kibbutz Galuyot") was captured in the Mediterranean Sea by the British navy and its passengers, including Laron, were deported to internment camps in Cyprus.

In 1958 he was the founder of the Institute for Pediatric and Adolescent Endocrinology at the Beilinson Medical Center in Petah Tikva, affiliated to Tel Aviv University, and led it until 1992.

From 1983 to 1997 Laron was Incumbent of the Irene and Nicholas Marsh Chair in Endocrinology and Juvenile Diabetes, Sackler Faculty of Medicine, Tel Aviv University.

He also founded the All-Country Center for Juvenile Diabetes and an endocrinological laboratory aimed to develop new methods of detecting hormones in blood.

Pediatric and Adolescent Endocrinology, Volume 24 S. Karger Pub, Basel, 1993 Zvi Laron, S. Mastragostino, C. Romano Limb Lengthening for Whom, When & How?