Lives and works as theoretician, artist and musician in Berlin and Hamburg. Studied Philosophy at the TU Darmstadt, Music and Composition at the Conservatory of Hilversum and Rotterdam, Berklee School of Music, Boston. Master of Human Resources/ Organisation-Development at the TU Kaiserslautern. 1992-2000 head of the Studio for Improvisation at the Academy of Music, Darmstadt. Since 2002 head of ifit, Institute for ImprovisationTechnology, Berlin. From 2004-2008 Dell was member of the advisory board of the International Forum of Design, Ulm. Since 2009 he is member of the ANCB Network Campus executive board. From 2006 to 2007 he was teaching Architecture Theory at the University of Fine Arts Berlin. From 2008-2010 he was Professor for Urban Design Theory at HafenCity University, Hamburg, where he also co-lead the research-project „University of neighbourhoods“. Teachings a.o. at Architectural Association, London, University of the Witwatersrand Johannesburg, Columbia University New York, Academie for Bouwkunst, Arnhem. Dell is author of numerous articles and books a.o. “Prinzip Improvisation“, Cologne 2002, „Improvisations on Urbanity“ Rotterdam 2009 (with Ton Matton), „Tacit Urbanism“, Rotterdam 2009, and REPLAYCITY (Berlin2011).