Ken Thompson is all for Fortran!
Fortran is still used today by top scientists from organizations such as NASA and the Department of Energy on the world’s most powerful supercomputers. It is also used in physics departments, supercomputing centers, and government agencies
Fortran is a general-purpose, compiled imperative programming language developed by IBM in the 1950s for scientific and engineering applications. It is a natively parallel programming language with intuitive array-like syntax to communicate data between CPUs, allowing almost the same code to be run on a single CPU, on a shared-memory multicore system, or on a distributed-memory HPC or cloud-based system.
Thompson worked at Bell Labs for most of his career where he designed and implemented the original Unix operating system. He also invented the B programming language, the direct predecessor to the C programming language, and was one of the creators and early developers of the Plan 9 operating system.