ARM began when two engineers, Steve Furber and Sophie Wilson (formerly Roger Wilson), at the British company Acorn Computers Ltd, decided to design their own processor.
BTW, I came across a great beginners intro to writing a small OS in ARM assembly for the ARM based 35 dollar Raspberry Pi computer.(Cambridge University)
I, too, am a fan of the ARM architecture. And them incorporating proven supercomputer techniques like non-uniform memory access (NUMA) into multi-core products shows they know what they’re doing. The Megahertz race is over; power consumption killed that. Now, it’s cores and more cores, and techniques to make them viable.