Hellerman

You know it’s just not in one location, it’s everywhere,” Hellerman said.

Hellerman, H., "Experimental Personalized Array Translator System", Communications of the ACM, 7, 433 (July, 1964).

In 1963, Herbert Hellerman, working at the IBM Systems Research Institute, implemented a part of the notation on an IBM 1620 computer, and it was used by students in a special high school course on calculating transcendental functions by series summation.

Students tested their code in Hellerman's lab.