- Author: Geoffrey Marks Author Record # 216487
- Legal Name: Gardemann, Jan
- Birthplace: Free and Hanseatic City of Hamburg, West Germany
- Birthdate: 16 December 1961
- Language: German
- Webpages: jangardemann.de
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Collections
- Pestmarie (2008) with Ernst Vlcek and Uwe Voehl
- Die Rache des Puppenmachers (2007) with Christian Montillon and Peter Morlar
- Die Hexe am Lech (2007) with David Steinhart
- Das schwarze Grimoire (2008) with Dennis Ehrhardt and Peter Morlar [only as by Geoffrey Marks and Peter Morlar and Dario Vandis]
- Baal (2009) with Dennis Ehrhardt and Uwe Voehl [only as by Geoffrey Marks and Dario Vandis and Uwe Voehl]
- Baal (2014) with Peter Morlar and Uwe Voehl
- Die Tränen der Engel (2007)
- Das Kastell der Qualen (2007)
- Der Dämon von Madagaskar (2007)
- Das magische Geflecht (2008) with Ernst Vlcek and Uwe Voehl
- Das Pestbalg (2008) with Dennis Ehrhardt [only as by Geoffrey Marks and Dario Vandis]
- Der schwarze Augustin (2008) with Ernst Vlcek and Uwe Voehl
- Pestmarie (2008) with Ernst Vlcek and Uwe Voehl
- Zeitloser Horror (2007) by uncredited