I don't really understand why lisp was so intrinsically tied to expert systems and AI. It seems to me that Scheme (and, to an extent, common lisp or other lisps

I don't really understand why lisp was so intrinsically tied to expert systems and AI. It seems to me that Scheme (and, to an extent, common lisp or other lisps) are pretty good platforms for experimenting with software ideas; long before Jupiter notebooks existed.