It's said that T-Bone Walker was the first person who ever recorded a Blues song playing an electric guitar. He came from a musical family, where his parents were friends of Blind Lemon Jefferson. You might say that he learned the Blues from Jefferson around the dinner table.
He was a pioneer, and influenced some people you've heard of. Chuck Berry said he was one of the main influencers of Barry's style. B.B. King said he decided to play the electric guitar after listening to Walker. Jimi Hendrix started playing the guitar with his teeth after seeing Walker do it.
And did I mention "influential"? Here's Allman Brothers Band with Eric Clapton doing Walker's "Stormy Monday Blues".