Who invented the Smalltalk programming language?

The Little Smalltalk system was the first Smalltalk interpreter produced outside of Xerox PARC. Although it lacked many of the features of the original Smalltalk-80 system, it helped popularize the ideas of object-oriented programming, virtual machines, and byte-code interpreters. The little smalltalk system was later rewritten in Java, and distributed as the SmallWorld system.