In Grad School I started with an "AI in Lisp Textbook" (which was still the most common at the time in the late oughts, I hear many have moved to Python since) and searched for a Common Lisp interpreter that felt right. I think I ended up with SBCL [0], but this was obviously a while back so my memory is slippery about it.

(The professor I had for that AI course in Grad School didn't know Lisp and wanted to learn it better, especially because so much of the textbook was in it, so asked us for volunteers to learn it as well and I took that as an excuse/challenge to do every project with a language choice that semester in Common Lisp.)

[0] https://www.sbcl.org/