Kyriakos Destounis, a former PhD and current collaborator of CENTRA, was recently invited by Prof. Marc Casals to give a seminar at Centro Brasileiro de Pesquisas Físicas (CBPF) regarding current aspects and future prospects of quasinormal mode instabilities, the pseudospectrum of black holes and compact objects and the fate of black hole spectroscopy. Here, you can see him during the talk at the COSMO seminar.