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Sophie Langer
Sophie Langer
Email: s.langer(at)rub.de
Ruhr University Bochum
Universitätsstraße 150
44801 Bochum
Germany
I am a Professor in Mathematical Statistics at Ruhr University Bochum. Prior to this, I worked as an Associate professor in the Statistics group at University of Twente.
In 2020, I completed my PhD at the Technical University of Darmstadt under the supervision of Michael Kohler.
After graduating, I worked as a postdoctoral researcher with Johannes Schmidt-Hieber at University of Twente and with Lorenzo Rosasco at Universita' di Genova, before joining University of Twente as an Assistant professor in October 2022.
My research mainly focus on the mathematical understanding of deep learning, combining statistical and computational-related aspects, with particular focus on deep learning in image classification. Recently, I got also interested in analysing different optimisation schemes and regularisation methods used in deep learning's training like accelerated gradient descent, dropout and SAM.
News and Upcoming Events
News and Upcoming Events
🎉I have an open PhD/Postdoc position in our group at Ruhr University. If you are interested in joining us and have a strong background in Mathematical Statistics/ML Theory, please send me a mail with your CV and short research statement.
I am a new PI of the DFG-FWF Research Unit 5381 Mathematical Statistics in the Information Age
In March 2025, we started the initiative Kindness and Excellence in Academia, promoting a supportive, empathetic and inclusive academic environment. In case you are interested in joining our initiative or sharing your story related to this topic, feel free to contact me or email kindnessandexcellence[at]proton[dot]me.
Since January 2025, I am part of the strategic research initiative 'Real-World-Inspired Sequential Decision-Making' within 4TU.AMI
Invited talk at the Workshop "New challenges in high-dimensional statistics", CIRM, France (12/2025)
Seminar talk at TU Darmstadt, Germany (02/2026)
Seminar talk at Columbia University, New York (02/2026)
Invited talk at XVII Clapem, Uruguay (03/2027)
Seminar talk at University of St. Gallen (03/2026)
Seminar talk at University Bremen (04/2026)
Seminar talk at ESSEC Business school, Cergy, France (04/2026)
Seminar talk at Bocconi Unversity, Milan (04/2026)
Oberwolfach Workshop "Mathematical Foundation of Digital Twins, Oberwolfach, Germany (06/2026)
Organization of the Oberwolfach Workshop "Statistical Analysis of Black Box Models" (jointly with Peter Bartlett, Judith Rosseau and Sven Wang), Oberwolfach, Germany (03/2027)
Group
Group
My research would not be possible without my great PhD students and Postdocs.
Leon Halgryn (PhD student, joint supervision with Janusz Meylahn and Moritz Hahn)
Lea Kunkel (Postdoc)
Milena Braig (PhD student, starting in April 2026)
Dr. Gabriel Clara (former PhD student, joint supervision with Johannes Schmidt-Hieber - now Postdoc at UC Berkeley)
Dr. Clément Lezane (former PhD student, joint supervision with Wouter Koolen - now Postdoc at Université de Toulouse)
Awards and Grants
Awards and Grants
Veni grant, NWO Talent Programme, 2024 - 2027
Incentive grant (together with Moritz Hahn and Janusz Meylahn), University of Twente, 2024 - 2028
Ruth Moufang Price - Best female PhD-student in Mathematics, TU Darmstadt, 2020
Ruth Moufang Price - Best female Postdoc in Mathematics, TU Darmstadt, 2020
Editorial activities
Editorial activities
Electronic Journal of Statistics (2025 - )
Journal of Statistical Planning and Inference (2024 - )
Guest editor for a special volume on "Deep learning: Statistical perspectives", Journal of Statistical Planning and Inference (with Johannes Schmidt-Hieber and Taiji Suzuki), 2023/24
Miscellaneous
Miscellaneous
I was a member of the Young Academy at University of Twente (before leaving the Netherlands)
I want to support women in science as we are still strongly underrepresented. Without having really planned this career paths, I am today incredibly happy to do what I do. If you are thinking about a career in academia and are unsure, feel free to contact me and I will share my experiences.
Recently, I shared my academic journey with WAZ, see article
I have a weakness for Pizza. In my opinion, this is the place with the best.
I dance ballet and am a gifted yogi. Painting and writing helps me to switch off from everyday life.
I love quotes. One of my favorite is written below.
The invariable mark of wisdom is to see the miraculous in the common.
The invariable mark of wisdom is to see the miraculous in the common.
Ralph Waldo Emerson
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