Felix is an igneous petrologist and volcanologist and works on magma storage, evolution, and transport in active volcanic systems. His research integrates field volcanology, microanalysis, and petrological modelling to constrain pre-, syn-, and post-eruptive processes. His current focus is on Caribbean volcanoes, linking the rock record with geophysical, geodetic, and physical volcanology datasets to improve eruption monitoring and hazard assessment.