Thiago Marzagão

I'm Fitbod's Head of Data Science, Research & AI. Fitbod creates strength-training workouts that adapt to your body, recovery, and progress. I joined the team in 2021, after being a passionate Fitbod user for a few months.

At Fitbod I'm responsible for the algorithm that generates each workout, for analytics and A/B testing, for applied research, for patent applications, for hiring and developing data scientists, and for ensuring other teams get correct answers when they ask Claude and Codex data questions. I also participate in Fitbod's overall business planning and help build the product roadmap.

I have a Ph.D. from the Ohio State University. I took tons of stats classes and in my dissertation I used machine learning and newspaper articles to build the world’s first automated democracy index. I had a Fulbright scholarship.

Before Fitbod I worked in fraud detection, training machine learning models to identify corruption and bid-rigging. I have also taught statistics and machine learning at several universities, in both undergraduate and graduate courses.

In 2025 I moved to Spain and went full nomad for a while. I lived in Madrid, Oviedo, Gijón, Sevilla, Granada, Málaga, and eventually settled in València. In 2026 I learned how to pilot boats, biked the ~300km between Bruges and Amsterdam, and saw the Easter processions in Córdoba.

When I'm not on my laptop I'm usually dogfooding Fitbod in the gym, running or rucking in the Turia park, or reading (here's my Goodreads page). I speak English, Portuguese, and Spanish, and get by in French.