Francisco (Paco) Villaescusa-Navarro is a research scientist at the Flatiron Institute in New York City. He did his Ph.D. at the University of Valencia in Spain. He then held postdoctoral positions at the Astronomical Observatory of Trieste, Italy, and the Center for Computational Astrophysics in New York before becoming an associate research scholar at Princeton University, where he holds a visiting research scholar position. Paco is the main architect of the Quijote simulations, the largest suite of cosmological N-body simulations ever run. He is also part of the CAMELS core team, which designed and run the largest set of state-of-the-art hydrodynamic simulations to date. Paco combines the output of numerical simulations with machine learning methods to develop theoretical models to extract the maximum amount of information from cosmological surveys to unveil the Universe’s mysteries.