Dr Maren Westermann works as a machine learning engineer at DB Systel GmbH and holds a PhD in environmental science. She is a self taught Pythonista, a member of the documentation and contributor experience team, respectively at the open source machine learning library scikit-learn, and a team member of the open source library Narwhals. She is also a co-organiser of PyLadies Berlin where she mainly hosts open source hack nights.