Birgit Hummler was born in 1953, is married and has a daughter. After her studies of German and Slavic literature and postgraduate studies in journalism and communication sciences, from 1983 on, she worked as a freelance journalist. Among others, she supervised the development program of science journalism of the Robert Bosch foundation and nowadays works as freelance writer for various professional journals, PR agencies and companies. For her first crime novel Stahlbeton, Birgit Hummler was awarded the Stuttgarter Krimipreis in the category Best Economy Thriller.

Ulrich Hofmann, born in 1973, studied geology, geography, French, Spanish and German. He has lived in Bavaria, Spain, and Italy and currently lives in Berlin. He has worked as scriptdoctor, freelance corrector and author.

Peter Jakubowski was born in 1967 in Dortmund and studied economics at the University of Münster with a focus on environmental economics. After conducting research at the Institute for Transportation Research in Münster and at the German Aerospace Centre in Cologne he left in the summer of 2000 for the Federal Institute for Research on Building, Urban Affairs and Spatial Development (BBSR) in Bonn. There he increasingly focused on urbanistics, both in his research and his political consulting, and published on a wide variety of urban affairs. He lives with his family in Düsseldorf.

Gabriel Josipovici was born in Nice. During his course of education he first stayed in Egypt and later in England where he graduated in English literature in 1961. In the 1990s he resigned his occupation as lecturer in English at School of European Studies to entirely consecrate himself to his writing.
He is the author of fifteen novels, three volumes of short stories and six critical books, as well as of plays for stage and radio. Josipovici lives in Sussex and London.

Ann-Sophie Kaiser was born in Berlin where she still lives. She studied physics for one short semester at the Humboldt University before realising that she prefers writing. Kaiser loves to swim in the lakes of Berlin and to do long walks in the capital's neighbourhoods while imagining herself living in the historical Berlin. Unter den Linden 6 is her first historical novel.

Robert Kaltenbrunner was born in 1960 and trained as an architect and an urban planner before working from 1990 to 1999 as a project manager for large-scale urban projects in the Senate Department for Building, Housing and Transportation in Berlin. Since 2000 he heads the Department for Building and Housing at the Federal Institute for Research on Building, Urban Affairs and Spatial Development (Berlin/Bonn). He is co-editor of the journal Informationen zur Raumentwicklung and member of the academic board of FORUM STADT. He has published widely on urban affairs.

Mouhanad Khorchide was born in 1971 in Beirut, grew up in Saudi Arabia and studied Islamic theology and sociology in Beirut and Vienna. In 2010 he became professor for Islamic Religious Education and since 2011 he is head of the Centre for Islamic Theology in Münster, coordinator of the post graduate program for Islamic Theology of the Mercator foundation as well as principal investigator of the cluster of excellence “Religion and Politics in Pre-Modern and Modern Cultures”. Recent publications include Gott glaubt an den Menschen. Mit dem Islam zu einem neuen Humanismus (2015), Scharia – der missverstandene Gott: der Weg zu einer modernen islamischen Ethik (2013), Islam ist Barmherzigkeit: Grundzüge einer modernen Religion (2012).

Catarina Katzer, born in 1973, studied Economics, Sociology and Social psychology at the University of Cologne. While being a scientific assistant at the Institute for Economic and Social Psychology, she was the first at her chair to deal with the subject »The internet as a new market of boundless possibilities« and analysed the world wide web in the light of social psychology. Cyber psychology and Ethics of the Media became her special fields.

Meanwhile, Catarina Katzer works as an expert and consultant for companies and public agencies in Germany and abroad as well as for governmental institutions such as, for instance, child protection centers Germany, the Enquete commission »Internet & digital society« at the German Bundestag, the comittee at the council of Europe »Culture, Science, Education & Media« at Strassburg, the federal ministry for family, seniors. woman and youth in Berlin, the ministry for education in NRW and the National Council in Switzerland. Furthermore, she works on the Management Committees of the research networks COST Action »Cyberbullying« and COST Action »Cyberparks« for Germany within the EU government. And finally she works closely in research and teaching with the institutes of different universities, such as the University of Göteborg, the University of Tel Aviv, and the University of Dublin.

Murat Kurnaz, born and raised in 1982 in Bremen as the son of Turkish immigrants, completed an apprenticeship as shipbuilder. From February 2002 to August 2006 he was detained in the US Guantanamo military camp.
He now lives and works again in Bremen.

Hannes Klug was born 1966 in Esslingen. After his education at the Deutsche Journalistenschule in Munich, he studied comparative literature and North American studies at Frei Universität Berlin. For the Süddeutsche Zeitung, taz and Berliner Zeitung, he wrote about movies, literature and music; as an editor, he wrote about the USA and Canada, and as scriptwriter he created multimedia adventures and wrote several movie screenplays. His movie Ricky – Normal war gestern had its premiere in the cinemas in 2014. In 2015 Rowohlt published his novel Ich, Xi Lao Peng und die Sache mit meinem Bruder. Hannes Klug lives as freelance screenplay writer and author in Düsseldorf.