Who modified the first light bulb?

The first practical incandescent light bulb was developed by Thomas Edison in 1879, building upon earlier designs by inventors like Sir Humphry Davy and Joseph Swan. While Davy created an early version of an electric light in the early 1800s and Swan independently developed a working bulb around the same time as Edison, it was Edison's improvements to the filament and vacuum inside the bulb that made it commercially viable. Edison's work led to the widespread adoption of electric lighting.