Roland Bartetzko (born 1970 in Würselen) is a German soldier that volunteered for the Bosnian Croat side (the HVO) in the Bosnian War (1992–95) and the ethnic Albanian rebels (the KLA) in the Kosovo War (1998–99)(from Wikipedia).
Bartetzko has a university degree in law and is currently working for a law firm in Pristina, Kosovo. He published a study on radical Islam in Kosovo and his analysis on counterinsurgency "A-how-to guide for counterinsurgency" has been referenced by NATO as a recommended read.