Hi, I'm Chris.
I'm the Director of Machine Learning and Data Engineering at the Wikimedia Foundation, where I lead a team of engineers working on one of the last best places on the internet. Before this, I was Director of Data Science at Devoted Health and held similar data leadership roles elsewhere.
I've written a hands-on ML book with O'Reilly, created bestselling AI flashcards that helped thousands learn ML fundamentals, published hundreds of tutorials, and hosted a popular data science podcast. I also founded a data visualization startup and built open source tools used by thousands. These days, I'm deploying AI at Wikipedia-scale while navigating the real-world challenges of costs, performance, and infrastructure.