Derek Sherinian (born August 25, 1966) is an American ‎rock and jazz fusion keyboardist based in Los Angeles, California. After studying at the Berklee College of Music, Sherinian became a keyboardist and sideman for a number of artists, including Alice Cooper, Billy Idol, Yngwie Malmsteen, Kiss, and Zakk Wylde. He has also played keyboards for Dream Theater and Platypus, and is the co-founder of the band Planet X. His solo albums feature several prominent artists, including Slash, Allan Holdsworth, John Sykes, and Jerry Goodman.

Sherinian has been called the “King of the Keys” and the “Caligula of keyboards” due to his performing style. His influences include Elton John, Keith Emerson, Jan Hammer, and a variety of guitarists. Sherinian endorses various equipment, including Korg and Clavia keyboards. He is of Greek-Armenian descent and has a special interest in Armenian history.