An American musician, most known as the bassist for the Allman Brothers Band and Sea Level.

Influenced by players from James Jamerson to Stanley Clarke, by the 1960s Williams was playing bass in a soul music band known as Sounds of Soul with Jai Johanny Johanson, the future drummer with the Allman Brothers.

In 1968 Williams was drafted into the United States Army and sent into the Vietnam War. Opposed to the war and to killing in general, Williams went AWOL frequently and wandered around the jungles of South Vietnam, occasionally returning to various units. He was given an honorable discharge in 1970.

Williams joined the Allman Brothers in late 1972 after the death of original bassist Berry Oakley, and played in the band at the peak of their commercial success. Williams' style was more traditional than Oakley's lead guitar-like approach and freed the band's drummers to be more adventurous.

After the Allmans dissolved in 1976, Williams founded Sea Level with Jaimoe and Chuck Leavell. In Sea Level he played in a looser, more jazz-like fashion. Williams left Sea Level in 1980, shortly before that band broke up.

Williams was found to have lung cancer in 1981, caused (his doctors believed) by exposure to Agent Orange during his stay in Vietnam. He died less than two years later, aged 34.