Chuck Leavell
Charles Alfred Chuck Leavell is an American musician, who was a member of the Allman Brothers Band during the height of their 1970s popularity, a founding member of the jazzrock combo Sea Level, a frequently employed session musician, and longtime touring member of the Rolling Stones. Leavell has also toured and recorded with Eric Clapton, George Harrison, Govt Mule and John Mayer.
In 2011, Leavell played on John Mayers album Born and Raised which was released in May 2012, reaching Number One on the Billboard Chart.
Source: Wikipedia