The main Focus drummer has been Pierre Van Der Linden who originally worked with Jan Akkerman in Brainbox. After leaving in 1973 he rejoined the band more than once. The original drummer was Hans Cleuver. In the early days on at least one trip Akkerman's late brother Cocky sat in. Other main drummers have been the Englishman Colin Allen, the Americans David Kemper and Steve Smith and the appropriately named Dutchman Bert Smaak. When the current Focus first reformed the drummer was Ruben Van Roon and in 2004 Hans van Oosterhout was playing with them. Other Focus drummers include Richard James and Henk Zomer (one gig in Amersfoort in 1977).