If Alan Kay is Smalltalk's father, Dan Ingalls is its mother—Smalltalk may have started as a gleam in Alan Kay's eye, but Ingalls is the one who did the hard work of bringing it into the world. Starting with the first implementation of Smalltalk, written in BASIC and based on one page of notes from Kay, Ingalls has been involved in implementing seven generations of Smalltalk from the first prototype to the present-day open source implementation, Squeak.
Originally a physicist, Ingalls started programming with Fortran, made a business selling a profiler he wrote while in grad school, and eventually found his way to Xerox PARC, where ...
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