I am interested in the formation and dynamical evolution of globular clusters to shed light on the stellar initial mass function, black holes, gravitational waves and the dark matter distribution in galaxies. The Milky Way contains 150 globular clusters, for which we have exquisite observations, including kinematics and chemistry. To understand these, I use both star-by-star N-body simulations and dynamical mass models. I developed a family of mass models (limepy) to search for black holes in star clusters and to probe dark matter in the Milky Way using data from the ESA-Gaia satellite and related surveys. I am also interested in the abundance problem of globular clusters.