Phil McLaughlin was an engineer at General Instruments (GI) that developed the SP0256 chip in the Intellivoice module.
Source Links:
web.archive.org/web/20200513055234/https://thegeekiverse.com/interview-stephen-maine-early-video-game-pioneer-creator-intellivision-graphics/
patents.google.com/patent/EP0051462A3/en