The High C Compiler was designed and built by the geniuses at MetaWare: Frank deRemer (MIT) and Tom Pennello (UCSC), the pair who invented LALR2 parsing. I worked there in the early 90s, great memories of Tom editing compiler code in his windows terminal so quickly that the screen couldn't update fast enough to keep up with him, he continued editing 'in the blind' on unseen code. Those two are/were seriously gifted computer scientists and they gave me my start in the software industry.