The flip side of the coin was that even good programmers and language designers tended to do terrible extensions when they were in the heat of programming, because design is something that is best done slowly and carefully.
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About Alan Kay
Alan Kay was a contemporary American computer scientist. Alan Curtis Kay is an American computer scientist who pioneered work on object-oriented programming and windowing graphical user interface (GUI) design. At Xerox PARC he led the design and development of the first modern windowed computer desktop interface. Read more on Wikipedia →