Nwabudike Morgan said:
Nolan Bushnell didn't do anything but steal Ralph Baer's idea.
An idea that failed. Bushnell saw the potential in that idea and was able make it a successful one.
You're forgetting the most important thing that Bushnell did, though. He was the first person to see that the games that were being played by computer hobbyists on university mainframes were something that were commercially viable, that they were something you could sell, something that people who didn't even know that you could play a game on a computer would pay to play, and by creating Computer Space, he gave birth to an industry.
Baer may have had the idea for machines that play games a decade earlier, but Bushnell is the why the games industry exists, since he was responsible for the first videogame ever to be produced in quantity, marketed and sold to customers. He is the man responsible for the videogame's entry into the public consciousness.