Ray Dolby
Net Worth: $3.5 billion
Profession: He is an American engineer, a movie director, and the inventor of the noise reduction system known as Dolby NR.
How He Made His Wealth: He is the founder and chairman of Dolby Laboratories, and he got rich by inventing audio processing systems that eliminate background noise.
Fast Facts: On top of being really good at keeping things quiet, he also enjoys doing other things like skiing, sailing, and flying airplanes and helicopters.