Worked at Xerox PARC in the Systems Concepts Lab (The Smalltalk group) and later at SunLabs in the Self group.  Co-invented SelfLanguage with DavidUngar, and was the principal inventor and developer of the AlternateRealityKit, which had a DirectManipulation interface with DragAndDrop.  AlternateRealityKit's unifying principle was that all objects in the system should be manifest on the screen, and directly manipulable by the user.

Currently at SunLabs: http://research.sun.com/people/randy/
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