Ioannis Bellas-Velidis obtained his BSc in Physics in 1976, his MSc in Astrophysics in 1978 and his PhD in 1990 from the Sofia University (Bulgaria). From 1975 to 1978, he worked as astronomer in the Public Observatory at Kardjaly (Bulgaria) and from 1989 to 1994 to National Observatory of Athens. From 1994 to 2006, he worked as science support staff at the former Institute of Astronomy and Astrophysics of the National Observatory of Athens. In 2006, he was promoted to Associate Researcher and since 2009 he works as Senior Researcher at the Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing of the National Observatory of Athens.

Artificial intelligence methods development and application for data processing and analysis (in astrophysics, engineering and medicine), classification and parameterization of galaxy spectra, galaxies evolutionary spectra modeling, galactic and extra-galaxy stellar systems content, observational spectrophotometry and photometry of symbiotic and symbiotic-like stars, computer networks management.