Jeff Ament is a member of Pearl Jam.
Jeff Ament . Along with Stone Gossard , Mike McCready , and Eddie Vedder , he is one of the band 's founding members , and is also known for his work prior to Pearl Jam with the 1980s Seattle-based grunge rock bands Green River and Mother Love Bone , and is particularly notable for his work with the fretless bass , upright bass , and twelve-string bass guitar . Pearl Jam . Since its inception , the band 's line-up has comprised Eddie Vedder ( lead vocals ) , Mike McCready ( lead guitar ) , Stone Gossard ( rhythm guitar ) and Jeff Ament ( bass ) .