Ioannis Kaissas was born in Ellinochori – Evros – Greece. For successive years he worked as radiation physicist at Greek Atomic Energy Commission and at “Metaxa” Anti- Cancer Hospital. He has been awarded with the titles of Radiation Protection Expert in the fields of Medical Exposure and Non-Medical Exposure. He has been elected as assistant professor in November 2021. He teaches: Introduction to Nuclear Technology Applications, Theory and Technology of Nuclear Reactors and co-teaches: Heat Transfer and Applied Thermodynamics. His teaching activities include the supervision of diploma theses, in the topics of the application of nuclear technology in industry, medicine and the environment. He wrote the chapter “Coded Aperture Technique with CdTe Pixelated Detector for the Identification of the 3D coordinates of Radioactive Hot-Spots” in a book by Springer Publishing, edited by Kris Iniewsky. A project in which he participated was awarded the IEEE Publication Encouragement Award 2017. He chaired the meeting of the Radiation Protection and Public Health Committee of the Nuclear Energy Agency (NEA), in February 2020.