It's an interesting question, and one I'm not old enough to answer properly. From what I can tell, lisp was popular up until the 80s, where it was heavily used

It's an interesting question, and one I'm not old enough to answer properly. From what I can tell, lisp was popular up until the 80s, where it was heavily used in AI. Then there's a reference to an AI winter, where I suspect OO languages gained a lot of traction and lisp fell out of fashion.