Jeroen Janssens

Senior Developer Relations Engineer at Posit, PBC

Join us with Jeroen, Senior Developer Relations Engineer at Posit PBC, to chat about his experience writing books like "Data Science at the Command Line" and "Python Polars: The Definitive Guide," the importance of community and teaching in data science, and tips for aspiring data scientists looking to participate in the open source community.

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Libby Heeren - Host

Data Community Manager at Posit, PBC

I'm a data science educator and community builder who wants to help you cultivate a community of practice for yourself. I talk a lot about the benefits of making genuine human connections, the power of vulnerability, and why we all benefit when we show up as our whole selves. I'm also the host of the Data Humans podcast where my motto is: data science is not one thing.

portrait of smiling Rachael Dempsey standing in front of off-white wall

Rachael Dempsey - Co-host

Community Manager at Posit, PBC

I love connecting people across the data science community to share what they're accomplishing with data and help others do the same through community discussions, industry meetups, and more.

Jeroen Janssens

Senior Developer Relations Engineer at Posit, PBC

Jeroen Janssens, PhD, is a Senior Developer Relations Engineer at Posit, PBC. His expertise lies in visualizing data, implementing machine learning models, and building solutions using Python, R, JavaScript, and Bash. He’s passionate about open source and sharing knowledge. He’s the author of Python Polars: The Definitive Guide (O’Reilly, 2025) and Data Science at the Command Line (O’Reilly, 2021). Jeroen holds a PhD in machine learning from Tilburg University and an MSc in artificial intelligence from Maastricht University. He lives with his wife and two kids in Rotterdam, the Netherlands.