[theseoafs]

Historically speaking, Lisp was the de-facto language of AI for quite a bit of time. That's only been the case for classical AI research, however. People working on AI and machine learning these days aren't necessarily all working in Lisp -- they're usually working in high-performance languages, or in interpreted languages with high-performance libraries (e.g. Python plus numpy or scipy or what have you).

[NAFV_P]

Greg says he wrote his first LISP interpreter in FORTRAN, around the early 1970's. I was thinking that NEST might have code that emulates certain properties of LISP, I've heard of many LISP interpreters being written in other languages over the ages.