From 2003 to 2012 Christian's primary focus was to create a photographic trilogy on political, economic and religious power. In Protokoll (2007) Christian accompanies a member of the Swiss Federal Council on official occasions throughout the world. In Tropical Gift (2010) he captures the closed world of Nigeria’s oil and gas industry, and In Jesus’ Name (2012) he follows the members of a Zurich-based evangelical church over the span of a year. The three books were subsequently published by Lars Müller Publishers.

Following his photographic investigation into power, Christian trained his lens on the world of casinos and has published two further books. First in Las Vegas for his Insert Coins (2016) series, and most recently in Macau for his The Pearl River (2019) work.

Christian is a recipient of several other photographic awards and grants. In 2013, Christian was artist-in-residence by the Biennale des Arts Contemporains aux Libellules in Switzerland, publishing the book Libellules, with Héros-Limite (2015). His images are regularly published and are continuously being exhibited throughout the world.