Our research encompasses diverse projects and collaborations at the Ruhr-University Bochum and beyond. Find below information about the PI and the team.

Principal Investigator

Johannes Lederer

Johannes is Professor of Mathematical Statistics at the Ruhr-University Bochum. His educational training spans physics, mathematics, and statistics. After receiving a MSc in Physics, he started his Doctor of Sciences under the supervision of Sara van de Geer and Peter Bühlmann at ETH Zürich in December 2009 and completed the degree in December 2012. After that, he was a postdoctoral researcher hosted by Martin Wainwright at UC Berkeley, until he accepted the position as the Jacob Wolfowitz Visiting Assistant Professor in the Department of Statistical Science at Cornell University in August 2013. In September 2015, he joined the University of Washington as Tenure-Track Assistant Professor of Statistics and Adjunct Assistant Professor of Biostatistics at the University of Washington. In December 2017, Johannes was appointed in Bochum.

Johannes is currently also Visiting Professor at UC Louvain, Affiliate Faculty at the University of Washington, and Associate Editor of the Encyclopedia of Mathematics.

Post-doctoral Researcher

Fang Xie

Fang is a post-doctoral researcher in the group since August, 2018. She received her Master’s and PhD in Mathematics from University of Macau, China, in respectively 2015 and 2018. Fang has studied theories and methods for high-dimensional data. A particular focus of her current work with Johannes is on biological applications.

PhD Students

Yunqi Bu photo

Yunqi Bu

Yunqi is a PhD student in biostatistics at UW. She received her Bachelor’s degree in Mathematics from Nankai University, China, in 2013. Currently, she is working with Johannes on graphical models for high-dimensional data. In particular, she is developing models and methods to study brain connectivity. Visit her webpage for more information:


Yannick Düren

Yannick is a first year PhD student in mathematical statistics at Ruhr-University Bochum. He studied computational engineering science at RWTH Aachen University and received his Master’s degree in 2017. Yannick is currently working with Johannes on methods for high-dimensional statistics and biostatistics. In particular, they are interested in the application of probabilistic graphical models in the field of genetics.


Shih-Ting Huang

Shih-Ting is a PhD student in mathematical statistics at Ruhr-University Bochum He received his Master’s degree in mathematics from Temple University, USA, in 2015. Shih-Ting is working with Johannes on the development of novel methods for high-dimensional data.


Mahsa Taheri

Mahsa is a PhD student in mathematical statistics at Ruhr-University Bochum. She received her Master’s degree in artificial intelligence from IUT, Iran, in 2017. Mahsa and Johannes are working at the intersection of mathematics and computer science in high-dimensional statistics.

Rui Zhuang photo

Rui Zhuang

Rui is a PhD student of biostatistics at the University of Washington. Before joining the University of Washington, Rui received her Bachelor’s degree from Nanjing University, China and was a research assistant of genetics at Hong Kong University of Science and Technology. Currently, Rui is working with Johannes on high dimensional statistical inference. They are particularly interested in networks. For more information, please visit her website: .

Master’s Students

Mike Laszkiewicz photo

Mike Laszkiewicz

Mike has received his Bachelor’s degree in Mathematics from Ruhr-University Bochum in 2017 and is currently working on his Master’s thesis with Johannes. He focusses on high-dimensional graphical modeling in the plant sciences.