Answer
Andrew S. Tanenbaum is famously known for the creation of MINIX operating system. MINIX was an early Unix-like operating system created by Tanenbaum and first released in 1987. MINIX was designed as a teaching tool for operating systems courses, and was also used as a research platform for Tanenbaum and his colleagues. Although MINIX is no longer widely used, it is still considered to be an important historical operating system.