Etienne studied life sciences with focus on biochemistry at the University of Potsdam, where he obtained his bachelor’s degree. He obtained his master’s degree in Biochemistry at the free University of Berlin. For his master’s thesis, Etienne joined the group of Patrick Scheerer at the Charité-University medicine Berlin, where he investigated the structural basis of the reaction specificity of the lipoxygenase from Pseudomonas aeruginosa by X-ray crystallography. In April 2016 he started his PhD in the Structural Bioenergetics Group of Volker Zickermann at the Institute of Biochemistry II with focus on structural biology of mitochondrial complex I (NADH: ubiquinone oxidoreductase) in Yarrowia lipolytica. Currently Etienne applies various methods to develop new approaches for crystallization and functional analysis of complex 1.