David Martijn Westerholt (born 30 March 1979 in Waddinxveen, Netherlands) is the cofounder (along with Charlotte Wessels), keyboardist, and the main songwriter of the Dutch symphonic metal band Delain. He was previously a member of symphonic metal band Within Temptation, until he was diagnosed with infectious mononucleosis shortly after the release of Within Temptation's second full-length studio album, Mother Earth. His brother Robert Westerholt is the guitarist and founder of Within Temptation. He currently lives in Zwolle, where he resides since his study in Communictation at Windesheim College in 1998.
With Within Temptation
Westerholt is responsible for writing the majority of the music from Delain. He also co-wrote Restless, the song that was released as debut single by Within Temptation.
He currently uses both Korg and Roland Keyboards.