[1] In late 1979, Miller left Atari with three other programmers, David Crane, Larry Kaplan and Bob Whitehead.
With music industry executive, Jim Levy, they formed Activision, the first independent video game developer and publisher.
[3] Miller experimented with implementing a 3D display for the game Checkers but due to technical limitations of both the Atari 2600 and television sets of the era, the idea was dropped.
In September 2001, Miller rejoined David Crane at Crane's company, Skyworks Technologies, a leading developer of custom branded online games (advergames) for Fortune 100 companies, where he served as Vice President of Business Development for four years.
In a clinical trial with pediatric diabetes patients at Stanford University Medical Center and Kaiser Permanente, children who played the company's diabetes game, Packy and Marlon, experienced a 77% reduction in urgent care visits over six months, compared to children in the control group who were given a standard video game to play.