Derek Sherinian (born August 25, 1966) is a rock keyboardist who has toured and recorded for Alice Cooper, Billy Idol, Yngwie Malmsteen, Kiss, and Alice In Chains. He was also a member of Dream Theater and is the founder of the instrumental metal-fusion band Planet X. His solo albums feature several prominent artists, including Slash, Allan Holdsworth, Steve Lukather, John Sykes, Billy Sheehan, Zakk Wylde and Al Di Meola. Sherinian is a founding member of the supergroup Black Country Communion.
Sherinian has distiguished himself by his aggressive "guitaristic" approach to his keyboard style. He has been called the "King of the Keys" by Guitar World magazine and the "Caligula of Keyboards" by Alice Cooper. His influences include Elton John, Keith Emerson, Jan Hammer, and a variety of guitarists. He is an American of Greek-Armenian descent and has a special interest in Armenian history.