Bielefeld, Alemania, 2019
München, Alemania, 2017
Dessau, Alemania, 2015
Frankfurt am Main, Alemania, 2015
Vaduz , Liechtenstein, 2010
Abu Dhabi/ VAE, United Arab Emirates, 2010
Philadelphia, USA, 2009
Deutschland, Alemania, 2009
Tokio, Japan, 2009
Noordwijk, Países Bajos, 2009
Dublin, Ireland, 2008
Köln, Alemania, 2008
Forschungsarbeit, Alemania, 2006
Essen, Alemania, 2006
Düsseldorf/ Stuttgart/ München/ London, Alemania, 1999