Aron M. Rappaport

Aron Moses Rappaport (1904–1992) was a Czech-Canadian pathologist and physiologist recognized for his pioneering work in liver microanatomy. He is best known for refining the hepatic acinus model, which provided a functional classification of liver tissue based on blood supply and metabolic activity. His research significantly advanced the understanding of liver circulation and its implications for disease processes.

Early life and education Aron Moses Rappaport was born in Siret, Bukovina, in Austria-Hungary in 1904. He graduated in medicine in 1929 from the German University of Prague and subsequently trained in surgery in Germany and France. During World War II, he practiced medicine in Romania. In 1948, he emigrated to Canada, where he worked as a research assistant to Charles Best, co-discoverer of insulin. His interest in experimental cardiovascular surgery led him to study the liver's microcirculation, earning a PhD in 1952.

Academic career Rappaport was appointed Professor of Physiology at the University of Toronto in 1955. He spent the majority of his academic career at the University of Toronto, where he was a leading researcher in hepatic circulation, portal hypertension, and liver fibrosis. Even after his retirement, he continued working as a Senior Research Scientist at Sunnybrook Health Sciences Centre. In 1990, the Microcirculation Research Laboratory at Sunnybrook (formerly Sunnybrook Hospital) was named in his honor.

Research Rappaport's most significant contribution to hepatology is the hepatic acinus model, which he reintroduced as an improvement upon earlier concepts first described by Marcello Malpighi in 1666. His model classifies the liver parenchyma into functional units based on their proximity to the blood supply from the portal triad: