From 2007 to September 2014, he was treasurer of German association of investigative journalists Netzwerk Recherche [de].

Schraven published several reports about the German military action by the Bundeswehr in Afghanistan.

In 2012 he published his investigation of the German military actions in Afghanistan on a special website with leaked documents.

His graphic reportage "Kriegszeiten" was nominated for the international youth book award in Germany.

[6][7] He also won the Deutschen Reporterpreis for his book "Weisse Wölfe" (illustrations by Jan Feindt).