Alejo Martínez-Sansigre is apost-doc at the Max-Planck-Institut für Astronomie and prevously was a PhD student at Oxford University (Astrophysics Department). His research so far has concentrated on Active Galactic Nuclei, AGN.

He gave a talk ('Hidden quasars at high z') at UCM during his visit to CSIC colleages. The pictures show snapshots during the talk and discussion. You can read more about this topic in obscured quasars poster by Alejo.