That is Don Hopkins, “a very imaginative fellow” (according to Richard Stallman), hacker extraordinaire, and very active in (and leader of many) important and well-known software projects throughout the 1990’s, or thereabouts. Here on HN, he often comments with insightful historical context (in his inimitable style). Just don’t get on his bad side, is all I’m saying (at this time); I have personal experience, but you can simply peruse his comment history here.