The band was founded by John Myung, John Petrucci and Mike Portnoy. Myung and Petrucci are the only original members that are still in the band today. They changed their singer twice in the late 1980s when Chris Collins was replaced by Charles Dominici in 1987. Dominici left the band only three years later, in 1990, and James LaBrie joined and stayed until today. Dream Theater's keyboardist also changed three times. Kevin Moore played with the band from 1986 until 1995 when he left and Derek Sherinan took his position until 1999. Jordan Rudess is Dream Theater's Keyboardist now. He is known for his excellent technique and compositional skills. In September 2010, drummer Mike Portnoy left Dream Theater, and was replaced by Mike Mangini.