A: Cambridge, Massachusetts, United States
Expensive Typewriter, a text editing program written in 1961-62 for the DEC PDP-1 at MIT by Stephen D. Piner, has been called the first word processing program. It could drive an IBM Selectric typewriter, and was called "expensive" because the DEC PDP-1, the first minicomputer, then cost $100,000. The name was also taken in the spirit of a 1960 computer text editor called Colossal Typewriter.
♦ In December 2013 a report on the program written by Stephen Piner and dated August 1, 1972 was available the Computer History Museum at this link.