Band members are

Current
Chester Bennington - lead vocals (1999-present)
Mike Shinoda - emcee, vocals, rhythm guitar, keyboard (1996-present)
Brad Delson - lead guitar (1996-present)
Dave "Phoenix" Farrell - bass guitar, backing vocals (1996-1999, 2001-present)
Joe Hahn - turntables, programming, samples, beats (1996-present)
Rob Bourdon - drums (1996-present)

Former
Mark Wakefield – Vocals (1996–1998, while the band was named Xero)

Stand-in's
Kyle Christener— Bass guitar (1998–1999) Temporarily replaced Phoenix
Scott Koziol— Bass guitar (1999–2001) Stand-in bass player on Hybrid Theory