Koos van der Velde, born 1973 in Leeuwarden, the Netherlands, began playing the snare drum at the early age of six. He got his first full drum kit four years later, and by the time he was thirteen, he was already playing in his first metal band, Lunacy.
During his six years with this popular Friesian band, Koos also drummed for Disgrace and various other local metal and punk bands, gaining plenty of experience in playing live gigs.
In 1993 Koos joined experimental jazz-core band Megakronkel, a Dutch group which opened the way for bands such as Victims Family and NoMeansNo. Together with Megakronkel, Koos toured extensively throughout Europe and recorded the album ‘Neurotransmitter’ (Konkurrel, 1994) as well as a song for ‘Project Fake, A Tribute to the Minutemen’ (Easy Money Records, 1997).
Koos van der Velde joined the MetaQuorum project in November 2014.