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We represent you!

The Doctoral Representatives Council consists of two doctoral representatives from each department of the MNF and was built to enable and improve the exchange between all departments and their students.

You can contact us for ideas and suggestions regarding the Doctoral Representatives Council or everything related to your doctoral studies. We will collect your input and bring it to the attention of the different graduate school steering committees and/or offices. Vice versa we will bring information or requests to your attention. 

Concerning our interests, we elect delegates for different commitees like the Hochschulkonferenz, the student consilium, the Board of the Graduate Schools, the Promotionsausschuss and the Consilium AMNZ. 

Doctoral Representatives Council

Valentin Rappel - Main Representative

Valentin Rappel completed both his Bachelor and Master studies in Mathematics at the University of Cologne. Currently he pursues a PhD in the working group of Prof. Dr. Peter Littelmann at the Mathematical Institute of the University of Cologne. He works on "Loop groups and the Path model" as part of the CRC/TRR 191. His main interest is algebra more specifically representation theory of algebraic groups, quantum groups and the geometry of loop groups.

Joss Pepe Strache - Deputy Representative

Joss Pepe Strache performed his cooperative Bachelor studies at the FH Aachen and Forschungszentrum Jülich. In his research work at the Institute of Bio-Organic Chemistry he concentrated on the enantioselective synthesis of dihydrofurans employing cinchona alkaloids. In his Master studies at the University of Cologne majoring in organic chemistry the focus was set on natural product synthesis and catalysis. Currently, Joss Pepe is a PhD student in the research group of Prof. Dr. H.-G. Schmalz (University of Cologne, Institute of Organic Chemistry). His research interests are traget molecule synthesis as well as application of transition metal-catalyzed transformations.

Oliver Zingsheim

Oliver Zingsheim completed his Bachelor and Master studies in molecular physics focusing on high resolution millimeter- and submillimeter wave spectroscopy of astronomically relevant molecules. The “fingerprints” of these molecules can lead to their unambiguous assignment in space. Currently, Oliver is a doctoral candidate (Schlemmer group) located within the CRC 956 - “Conditions and Impact of star formation”; I. Physikalisches Institut. There he studies complex molecules so astronomers can understand the chemical evolution in space and answer the question of how complex molecules can be in the interstellar medium (Where does life come from?). A two month CRC 956 student exchange offered him the possibility to visit the McCarthy lab at the Havard-Smithsonian Center for Astrophysics. Oliver is also a member of the BCGS.

Marina Kemperle

Marina Kemperle obtained her diploma in Geology and Paleontology at the University of Cologne. Her diploma thesis was dedicated to petrologic conditions and microstructural evolution of high grade rocks from the Southern Granulite Terrain, South India. After her studies, Marina started working in the Department of Structural Geology and Petrology where she is responsible for the supervision and support for measurements on the Electron Microprobe and, since September 2017, Electron Backscatter Diffraction (EBSD) measurements on a Scanning Electron Microscope.

In September 2017, Marina started her PhD project at the Institute of Geology and Mineralogy at the University of Cologne. She investigates deformation mechanisms and rheology of polyphase rocks from the lower crust of Sri Lanka to develop applicable flow laws for the rheological behaviour of the continental lower crust.


Laura Müller

Laura Müller completed her Bachelor and Master studies at the University of Münster. During her Bachelor thesis she explored the mineralogy of quartz sands from Haltern am See, Germany.  Subsequently, in her Master thesis she studied the ferric iron content of experimental garnets and clinopyroxenes from the Earth’s deeper upper mantle (300 km depth).
Currently, Laura is doing her Ph.D. under the supervision of Dr. Raúl Fonseca at the Institute of Geology and Mineralogy of Cologne where she explores redox dependent isotope fractionation during lunar formation.

Sebastian Seidel

Sebastian Seidel studied geography (B.Sc.) and human geography (M.Sc.) with a minor in political science at the WWU Münster. Currently he is a PhD student in the research group Human Geography and its Didactics at the Institute for Geography Education at the University of Cologne. In his doctoral project he deals with the thematization of borders and territories in geography lessons, media and everyday life of students.

Michaela Höhne

Michaela Höhne obtained her Bachelor´s degree in biological sciences at the University of Kaiserslautern, where she also completed her Master studies in molecular cell and neurobiology. Currently, she pursues her PhD at the Institute of biochemistry in the group of Prof. Dr. Jan Riemer (University of Cologne), investigating the regulation of mitochondrial hydrogen peroxide release and its role for signaling in mammalian cells using roGFP2-based sensors.

Dennis Zeh

Dennis Zeh completed his Bachelor studies in chemistry at the Eberhard Karls University Tübingen, focusing on organic chemistry in the research field of carbohydrates and synthesis of oligosaccharide mimetics. During his Master studies in the United States at the University of Massachusetts Boston he then focused on analytical chemistry and biochemistry in the field of mass spectrometry, investigating toxin induced protein expression levels in HeLa cells and the influence of ion interference in MS2 and MS3 tandem mass tag experiments. Currently, Dennis is a PhD student in Prof. Schäfer’s group at the University of Cologne (Institute for Organic Chemistry), working on gas phase reaction mechanism elucidation and ion/molecule reactions in the gas phase.

Yana Staneva

Yana Staneva completed both her Bachelor and Master studies in Mathematics at the University of Glasgow, Scotland, UK. Currently she is doing her PhD studies in the research group of Prof. Dr. Markus Kunze at the Mathematical Institute in the University of Cologne. Yana is working on "Algebraic and analytic aspects of integrable systems", funded by CRC/TRR 191. Her interests lie mainly in the intersection of physics and mathematics, more precisely, dynamical and integrable systems.

Jennifer Gerbracht

Jennifer Gerbracht obtained her Bachelor’s degree in molecular biology at the Johannes Gutenberg-University in Mainz. She then moved to Cologne to pursue a Master’s degree in biological sciences with a focus on genetics and cell biology. During her postgraduate studies, she spent four months at Newcastle University (UK) investigating the genetic causes of skeletal dysplasias. Currently, she is a PhD student in Prof. Niels Gehring’s group at the Institute for Genetics at the University of Cologne. Her research focuses on mechanisms and processes that regulate the fate and stability of messenger RNAs in human cells.

Leonardo Rydin

Leonardo Rydin finished his Bachelor in the University of Lisbon in Physics in 2013 and moved on to the University of Bonn to obtain his Master’s degree in Physics in 2017. His Master thesis revolved around the emergence of anomalous behaviour of coupled-oscillator-system dynamics contingent on the topology of coupled network structures, under the supervision of Prof. Dr. Lehnertz. Leonardo is currently doing his Ph.D. under the supervision of J.-Prof. Dr. Witthaut in the Institute for Theoretical Physics and the Research Centre Jülich, researching stability and operationality of modern-day electrical power-grid systems.