Jeffrey Allen Ament (born March 10, 1963 in Havre, Montana) is the bassist for the American rock band Pearl Jam. Along with Stone Gossard, Mike McCready, he is one of the founding members of the band.
Prior to Pearl Jam, Ament is known for his work with 1980s Seattle-based grunge rock bands Green River, Mother Love Bone, and Temple of the Dog and may be considered the Grandfather of the Grunge movement. He is particularly notable for his work with the fretless bass, upright bass and twelve-string bass guitar.
After Ament left Montana for Seattle he worked in coffee shops to pay the rent while he focused on his music career. Green River, named after the then-at-large serial killer of the same name (and also a river ten miles south of Seattle), was a punk-inspired band Ament formed with Mark Arm, who went on to front Mudhoney, and Steve Turner. Turner was later replaced by guitarist/bassist Bruce Fairweather. Green River is thought by many to be the first "real" grunge band and their release Dry As A Bone/Rehab Doll was the very first release on Bruce Pavitt's now infamous Sub Pop records.
Ament was also a member of the side project band Three Fish. He played on Neil Young's Mirror Ball release and in 2008, Ament released his first solo album, Tone.
Ament continues to live in the Seattle area and is a basketball enthusiast of the highest order.