Christos A. Frantzidis received the Diploma degree in electrical and computer engineering, the M.Sc. degree in medical informatics, and the Ph.D. degree in neurophysiological evaluation of nonpharmaceutical cognitive and/or physical interventions aiming to promote healthy aging from the Aristotle University of Thessaloniki (AUTH), Thessaloniki, Greece, in 2006, 2008, and 2014, respectively. He was a Visiting Researcher with the European Space Agency-funded bed-rest study held in the envihab premises of the German Aerospace Agency, Cologne, Germany. He is currently collaborating with the Greek AeroSpace Medical Aviation, Kalamaria, Greece, and the Laboratory of Medical Physics, School of Health Sciences, AUTH, toward brain-network and functional connectivity analysis. He is studying the effects of both physiological and pathological aging and the detrimental effects of microgravity on sleep physiology. He has authored the paper What are the symbols of Alzheimer? A Permutation Entropy-based symbolic analysis for the detection of early changes of the electroencephalographic complexity due to mild Alzheimer which received the third prize in the Best Student Paper Competition during the 12th IEEE Conference on BioInformatics and BioEngineering, Larnaca, Cyprus, in 2012.