You are strongly advised to (learn and) use Lisp if you intend to do any research in AI. Moreover, there are good reasons to learn Lisp even if you want to make it in the real world of e-commerce; see:
If you decide to use Lisp:
The implementation of Lisp for this course is
Allegro Common Lisp (
acl), which runs under the Unix
You will be expected to learn the idiosyncrasies of Allegro Common
Lisp on your own.
The best text is:
information on Lisp, see Marty Hall's
"An Introduction and
Common Lisp" website.