In 1998, Warren-Green became Principal Guest Conductor of the Nordic Chamber Orchestra, taking over as Chief Conductor from 2001 until 2005. From 1998 to 2001, he was Chief Conductor of the Joenkoeping Sinfonietta.
In 1998, Warren-Green assumed the role of Principal Guest Conductor of the Nordic Chamber Orchestra, succeeding as Chief Conductor from 2001 to 2005. From 1998 to 2001, he held the position of Chief Conductor of the Joenkoeping Sinfonietta.