Heisuke Hirona, a renowned mathematician known for his contributions to algebraic geometry, passed away on the 18th at the age of 94. He was hailed as the recipient of the Fields Medal, often referred to as the Nobel Prize of mathematics. Born in Yamaguchi Prefecture, Hirona graduated from Kyoto University and earned his doctorate from both Harvard University and Kyoto University. His academic career included positions at Brandeis University and Columbia University, before he joined Harvard as a professor in 1968, while simultaneously taking on a professorship at Kyoto University in 1975.

Hirona specialized in algebraic geometry, an area of mathematics that underwent significant development in the 19th and 20th centuries, focusing on solving the mysteries of algebraic varieties represented by equations. His pioneering work addressed difficulties related to singular points in geometric shapes, leading to breakthroughs that generalized solutions across any dimension, an achievement that was previously restricted to three dimensions before his research.

Throughout his illustrious career, Hirona received numerous accolades, including the Asahi Prize in 1967 and the Japan Academy Prize in 1970, becoming only the second Japanese to receive the Fields Medal that same year. He became the first recipient of the Order of Culture born in the Showa era in 1975. Beyond his mathematical endeavors, he was deeply committed to the promotion of mathematics education and mentoring young scholars, founding the Mathematical Science Promotion Association in 1984 and serving as president of Yamaguchi University from 1996 to 2002.