In January 2018 Ernest Alsina Ballester finished his PhD thesis at the IAC on "The transfer of resonance line polarization with partial frequency redistribution in the presence of arbitrary magnetic fields”,with Luca Belluzzi (IRSOL) and Javier Trujillo Bueno (IAC) as his thesis advisors. In his thesis, he developed a radiative transfer computer program that allows to calculate the Stokes profiles of some resonance lines in 1D magnetized models of stellar atmospheres, taking into account partial frequency redistribution phenomena in the scattering events and the joint action of Hanle, Zeeman and magneto-optical effects. During the last three years he worked as a post-doctoral researcher at IRSOL, in a project aimed at the modeling and interpretation of spectropolarimetric observations of chromospheric and transition region lines, along with the development of more realistic (multi-level) radiative transfer codes. In February 2021 he joined the IAC, where he is a post-doctoral researcher of the POLMAG research team contributing to the development of WP-4 and WP-6.