The study of the gravitational interaction and fundamental symmetries on neutral antimatter, in particular on neutral atomic systems (antihydrogen and positronium, or Ps), are my main research interest. Born an experimental particle/laser physicist, I first focused on the development of a pulsed laser system for Ps laser excitation to the Rydberg levels at the AEgIS experiment (master thesis), that later conducted to the first spectroscopy of the n=3 state of Ps. Recently, I have been coordinating the Ps working group of the experiment. We have obtained the first laser excitation of Ps to Rydberg levels in the cryogenic, high magnetic field environment of AEgIS.