I got my physics bachelor at the UAM in 1991 and my PhD at the USC in 1995. Afterwards I made postdoctoral stays at LPT Orsay and Universität Hamburg, to become associate professor in physics at Universidad de Córdoba in the period 1998-2002. Then I was Fellow at CERN to come back to IGFAE at the USC in 2005 with a Ramón y Cajal contract. I became associate professor in 2010 and full professor in 2020. I am a theoretical physicist. My main research interest is the behaviour of the strong interaction and of the quantum field theory that describes it, QCD, at large energies and parton densities. Specifically, I work on the description of hadron and nuclear wave functions and of the first instants of a hadronic collision, in the framework of the Color Glass Condensate effective field theory. These aspects are studied nowadays in collisions between protons and nuclei at the Large Hadron Collider at CERN, and in the future in electron-ion colliders: the Electron-Ion Collider at BNL in the US and the proposed Large Hadron-electron Collider at CERN of which I am member of the coordination committee. I also work on the characterisation of the matter created in such collisions through perturbative probes: jet quenching and quarkonium suppression. Besides, I am interested in high energy cosmic ray physics, on the behaviour of open quantum systems and on the thermalisation and emergence problems in QCD.