László "Les"[1] Bélády (April 29, 1928, in Budapest – November 6, 2021) was a Hungarian computer scientist notable for devising the Bélády's Min theoretical memory caching algorithm in 1966 while working at IBM Research.
Then he worked as a draftsman at Ford Motor Company in Cologne and as an aerodynamics engineer at Dassault in Paris.
In the 1960s and 1970s, he primarily lived in New York City with stints in California and England, where he joined International Business Machines and did early work in operating systems, virtual machine architectures, program behavior modeling, memory management, computer graphics, Asian character sets, and data security.
He focused the program on creating advanced technology for aiding the distributed design of large complex software systems.
From 1991 to 1998, he served as president and CEO of Mitsubishi Electric Research Laboratories, Inc. (MERL).