He's clearly a Youtube sensation racking up millions of views on several compilations. Jenkees supposedly began playing music at 4 years old, when he received a toy keyboard for Christmas as a gift during his stay in hospital after being diagnosed with mild autism. (This fact is contested and has not been substantiated)
Here's an excerpt from Wikipedia.com,
He learned simple melodies and played with friends. He attempted piano lessons in the seventh grade, but these were unsuccessful. Jenkees discovered how to sequence and layer music using his Yamaha keyboard, and began playing hip hop music. He joined a marching band in high school, and despite being unable to read sheet music, the band director let Jenkees create his own keyboard parts and "jam out" in state competitions. The band director encouraged Jenkees to learn to read music. (click here to read more: Ronald Jenkees)
All I can say is - Impressive finger work! Watch and listen to him in "Throwing Fire"
Jenkees independently released his first album in 2007 (Ronald Jenkees) and has recently released his second album, Disorganized Fun.