Other than Minsky, I don’t think others (who are nevertheless scientists in their respective fields) are considered to have made significant contributions to modern machine learning or AI. McCarthy’s work around this topic culminated in LISP, leading to Emacs, a text editor! From that period, Rosenblatt’s work was instrumental to modern AI.
Claiming that the creator of LISP did not have a significant impact on AI is not a defensible position.
Some people consider that the logic-based approach to AI pioneered in this conference contributed to an (what we now call) AI winter. People like John Pierce of Bell Labs, a very influential figure in government, defunded research in computation-based AI such as for speech recognition (he wrote articles, saying, basically, researchers pursuing these techniques are charlatans).
There is no major algorithm or idea in undergrad machine learning textbooks named after these people. There are other people from that era.