And here's some interesting background info on the late John Allen which I just stumbled upon:
John Allen (1937-2022) and Anatomy of LISP https://mcjones.org/dustydecks/archives/2024/04/11/1249/
John Allen (1937-2022) and Anatomy of LISP https://mcjones.org/dustydecks/archives/2024/04/11/1249/
https://softwarepreservation.computerhistory.org/LISP/book/A...