Postscript was a close descendant (basically a V2) of Interpress, which is the printing language we used for laser printers at (and from) PARC from the 1970s.

Postscript was a close descendant (basically a V2) of Interpress, which is the printing language we used for laser printers at (and from) PARC from the 1970s. Postscript was designed by the authors of Interpress when they left PARC to start Adobe. Two nerds, engineers and computer scientists, wrote it, taking into account their experiences of what worked and what didn't. Things like PSD were designed by committees within Adobe, taking account marketing's concerns and building consensus around a camel when a horse, or perhaps cheetah, would have been vastly superior.