Ralph Baer started the development of the Magnavox Odyssey back in 1966 (known as the "Brown Box" back then) and released it for the public in 1972 starting one of the most profitable industries nowadays.
Baer, who is still working in the games industry, commented on the development of the Odyssey:
"People thought I was wasting my time and the company's money for that matter. There's no way anybody could have predicted how fast this industry would take off."Congrats Ralph!