It's amazing how Shannon contributed to almost everything important to understanding computers at all levels. He contributed to information theory (thus communication, error correction and compression), digital circuits (Master's thesis), Artificial Intelligence (not exhaustive: this paper, Theseus), cryptography and even circuit complexity!
As well known as he is for information, sometimes I think the breadth of his contributions to the foundations of computing are not fully appreciated.
You say AI, but even more precisely: I believe that his ideas form the core basis of modern LLMs actually (their probabilistic word sequence modeling underpinning), which is indeed extremely impressive and deep.
As well known as he is for information, sometimes I think the breadth of his contributions to the foundations of computing are not fully appreciated.