In 1966 together with A. Pertzelan and S. Mannheimer, they described a new type of dwarfism (subsequently named "Laron Syndrome") of growth hormone resistance characterized by high levels of GH in serum, and low IGF-I levels, Laron et al. so described the GH receptor defect, The Institute of Pediatric Endocrinology founded and led by him was among the first medical centers to produce and use in therapy the GH and IGF hormones and gonadotropin analogues. Prof. Laron was among the founders of the International Juvenile Diabetes Association, (ISPAD) He founded and served as Editor in Chief The European Society of Pediatric Endorinology (ESPE) and the Growth Hormone Research Society (GRS) of the scientific journals "Journal of Pediatric Endocrinology and Metabolism", "Pediatric and Adolescent Endocrinology" and "Pediatric Endocrinology Reviews". to present