Mathias Müller von Blumencron has been one of the Editors-in-Chief of DER SPIEGEL since 2008, in collaboration with Georg Mascolo. He is in charge of all digital products of the publishing house. Prior to this he was editor-in-chief of SPIEGEL ONLINE, which he developed into the leading German-language news site on the Internet and which currently employs over 100 journalists.