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...And Urs Hoelzle worked on the implementation of Self programming language when he was a PhD student at Stanford. Self was the result of a drastic simplification of Smalltalk. Applying Occam's Razor, Self used the prototype concept as the central organizational mechanism as opposed to Smalltalk's classes. Prototypes later were popularized by JavaScript (and of course, mangled in the usual JavaScript ways.)

See http://labs.oracle.com/features/tenyears/volcd/papers/intros... for a historical note. Smith & Ungar's "Self: Power of Simplicity" is a must-read for anyone interested in this topic: http://ranger.uta.edu/~nystrom/courses/cse3302-fa10/selfPowe...