Data Science Consulting & Training

You have data. I'm a data scientist. Let me help you gain more insight, make better decisions, and build smarter products. No matter where you're located, what market you operate in, or what stage you're at, I'd love to hear about you and your data. Simply drop me an email at and we'll take it from there.

About Me

Jeroen Janssens I'm an assistant professor of data science at Tilburg University. As an independent consultant and trainer, I help organizations making sense of their data. Previously, I was a data scientist at Elsevier in Amsterdam and startups YPlan and Outbrain in New York City. I have an MSc in artificial intelligence from Maastricht University and a PhD in machine learning from Tilburg University. Recently, I wrote a book titled Data Science at the Command Line, which was published by O'Reilly Media. My LinkedIn profile provides a more detailed overview of my background.

I have experience and affinity with: analyzing data using R and the Python scientific stack; organizing workshops and meetups; writing and presenting for technical audiences; managing data in MySQL, MongoDB, Redis, and AWS S3; collaborating with international teams of engineers and data scientists; programming in Python, JavaScript, and Bash; visualizing data with ggplot, TikZ, and D3; and performing large, distributed experiments.

Areas of Expertise

  • Data strategy

  • Data processing

  • Data visualization and analysis

  • Machine learning

  • Building prototypes

Professional Training

I currently offer three hands-on, full-day courses aimed at data scientists and engineers:

  • Data Science at the Command Line

  • Introduction to Machine Learning with Python

  • Visualizing and Analyzing Data with R

Besides these predefined courses, I can also deliver a custom course based on any of the technologies listed in the about section. To make the course more engaging and relevant, I can incorporate custom use cases based on your data and day-to-day challenges.


Jeroen came to our offices in Barcelona to deliver a one-day workshop on command-line tools for data science. I believe a lot in command-line tools to increase productivity, as well as giving access to data to the different teams, not only data analysts. Besides demonstrating a good knowledge and experience in command line tools for data science, Jeroen has very good training skills, his communication is clear, and he'll manage to adapt the level of the training to the level of the audience, which is not always easy!

Marc Canaleta, CTO at Social Point

One of the most important skills of a data scientist is exploration: of a new data set, or of new results produced by modeling. The UNIX philosophy of simple tools, each doing one job well, then cleverly piped together, is embodied by the command line. Jeroen expertly discusses how to bring that philosophy into your work in data science, illustrating how the command line is not only the world of file input/output, but also the world of data manipulation, exploration, and even modeling.

Chris H. Wiggins, Associate Professor in the Department of Applied Physics and Applied Mathematics at Columbia University and Chief Data Scientist at The New York Times

Jeroen is a great person to have on your team—not only has he built our event recommendation system and helped the team with every-day questions around our customers and data but he also organized a Python meetup at our NYC office, wrote a book (no small feat!), and performed in an occasional beat-boxing competition here and there.

Viktoras Jucikas, Founder and CTO at YPlan

I wholeheartedly recommend Jeroen Janssens for his programming and data analysis skills. His efficiency in implementing software prototypes is impressive. On top of that, he is a great communicator. During my collaboration with Jeroen I witnessed his skills in impressing academics, engineers, and managers with clear and appealing presentations and explanations. His extensive knowledge of the theory of machine learning algorithms and the practice of data analysis is unique.

Eric O. Postma, Full Professor in Artificial Intelligence at Tilburg University

Let's talk

Again, no matter where you're located, what market you operate in, or what stage you're at, I'd love to hear about you and your data. Simply drop me an email at and we'll take it from there. Looking forward to it!