Apostolos Mastichiadis was born in Athens in 1956, got his B.Sc. in Physics from National and Kapodistrian University of Athens (NKUA) in 1979, his M.Sc. in Astronomy from Sussex University in 1981 and his Ph.D. in Astronomy from Boston University in 1985. From 1985 to 1997 he was a Post-Doctoral Fellow/Research Associate at various Institutes and Universities: Max-Planck Institute for Extraterrestial Physics (1985-88), University of Adelaide (1988-90), Max-Planck-Institute for Nuclear Physics (1990-92, 1993-97) and NASA/GSFC(1992-93). In 1997 he joined the faculty of the Physics Department at NKUA as Associate Professor and became a Full Professor there in 2015. He has served as Director of the Section of Astrophysics, Astronomy and Mechanics, Physics Department, NKUA from 2013 to 2019 and as Director of the Astrophysics Labs from 2016 to present. His research interests include  radiation transfer, gamma and X-ray astronomy, cosmic rays and neutrino astrophysics. He has published more than 90 papers in refereed journals and he has about 4,500 citations. He is a member of the Hellenic Astronomical Society (Hel.A.S.), of the European Astronomical Society (EAS) and of the International Astronomical Union (IAU). From 2016-20 he acted as the President of Hel.A.S.