Our research encompasses diverse projects and collaborations at the Ruhr-University Bochum and beyond. Find below information about the PI and the current 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 post-doctoral 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 also Affiliate Faculty at the University of Washington.

Johannes is member of the local organizing committee of the Bernoulli-IMS 11th World Congress in Probability and Statistics, he is associate editor of the Canadian Journal of Statistics, and he is part of the machine-learning and artificial-intelligence group at RUB.

Post-Doctoral Researcher

Somnath Chakraborty

Somnath obtained a PhD and MSc in computer and systems sciences from TIFR Mumbai (India), having acquired experience working in areas such as computational learning theory and computational geometry. Before, he spent time at several universities in India and the US, where he undertook studies ranging from PDE to K-theory. Besides, Somnath is interested in representation theory, algebraic K-theory, geometry, and ancient Indian heritage of knowledge.

PhD Students


Ayşe Çobankaya

Ayşe received her Master’s and PhD degree from the Mathematics department at Cukurova University, Turkey. Her thesis involved algebraic topology, topology, module theory, and homological algebra. She is now working with Johannes on mathematical theories for deep learning.


Yannick Düren

Yannick studied computational engineering science at RWTH Aachen University and received his Master’s degree in 2017. Yannick and Johannes are currently working 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.


Pegah Golestaneh

Pegah received her Master’s degree in artificial intelligence from IUT, Iran, in 2016. Pegah and Johannes are developing statistical theories for deep learning.


Ayla Jungbluth

Ayla is a PhD student in mathematical statistics at Ruhr-University Bochum in cooperation with an engineering company. She received her Master’s degree in mathematics from Ruhr-University Bochum in 2022. Ayla and Johannes are currently working on time-series forecasting based on deep learning.

Mike Laszkiewicz photo

Mike Laszkiewicz

Mike received his Master’s degree in mathematics from Ruhr-University Bochum in 2019. He did his Master’s thesis with Johannes on high-dimensional graphical modeling. He is currently working on the intersection of high-dimensional statistics and deep learning. Mike is co-advised with Asja Fischer.

Ali Mohaddes photo

Ali Mohaddes

Ali received his Master’s degree in applied mathematics from Sharif University of Technology. He did his Master’s thesis on rough paths and their applications in machine learning. Now, he is working on the mathematical theory of deep learning.


Mahsa Taheri

Mahsa 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.

Bachelor’s and Master’s Students

We have a number of Bachelor’s and Master’s students; contact us if you are interested in joining.


Former post-doctoral researchers and PhD students with subsequent jobs:

Yunqi Bu

Data Scientist at Amazon, Seattle

Shih-Ting Huang

Post-Doctoral Researcher at Washington University, St. Louis

Nehemy Lim

Visiting Assistant Professor at University of Connecticut, Storrs

Fang Xie

Assistant Professor BNU-HKBU United International College, Zhuhai

Rui Zhuang

Data Scientist at Microsoft, Bellevue