Schröm has worked at stern magazine since 2007 where he published a series of articles on German politicians and security agencies and their involvement in America's war on terror. Together with a colleague he revealed that German authorities were aware of the innocence of German born Murat Kurnaz but let him stay in Guantanamo for four more years. 2009 he contributed to the report "Iran could ignite a nuclear weapon in six months" that gained much attention in international media. In summer 2010 he interviewed Heinrich Kieber who had stolen a Liechtenstein bank's client database and sold it to international tax authorities. Kieber is wanted by Interpol and lives in hiding. Between fall 2010 and sommer 2011 he uncovered with colleagues the criminals behind the international football match-fixing in a series of articles. 2012 his investigative team researched one of the biggest scandals in the last 10 years in Germany which is named as NSU case in Germany. In 2013 he revealed with his team a network of private companies in Germany that act as henchmen for U.S. intelligence services and the mafia connection of Germany's most prominent rap star Bushido.
