Billy Roberts is credited on the "Are You Experienced" album. (I learned that just now by following a chain of links around Wikipedia, starting from the reference offered above by M.Ted.)

heyjoe.org provides three or four pages of very interesting stuff, including the harmonic analysis that the song's repetitive chord structure ~ a straight-ahead "circle of fifths" ~ is something that many guitar players have undoubtedly "written" independenly, each pretty much on his own after learning a few basic chords plus a little bit of elementary music theory