Planning Research Corporation. Mesa Scientific
Mesa Scientific Corporation was a consulting firm founded by a group of engineers that left National Cash Register. They had expertise in creating FORTRAN compilers which they did for several different types of computers.
They eventually branched into a joint venture creating the software for the display consoles used at the Apollo launch complex at Cape Canaveral. The company was purchased by Planning Research Corporation in 1964 and the group kept on working closely with various NASA projects.