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He graduated from the National and Kapodistrian University of Athens in 1971, He took his specialty in Pathology (1977), in Cytopathology (1983) and his PhD (1980). Since 1994 he was appointed as Visiting Professor by the University of Toronto. Since 1996 he was appointed as Visiting Professor by the University of Toronto of Canada. He was trained in Endocrine Pathology at St Michaels Hospital, University of Toronto, Canada (1998), in Neuropathology at the Mayo Clinic, Rochester, Minnesota USA (1991 and 1994), and in artificial Intelligence and Computer Expert Systems at the University of Southern California (1991). He has served for 20 years as Head of the Department of Pathology at “G. Gennimatas” General Hospital of Athens and Director of the “National Pituitary Tumor Reference Center” of Greece. He is currently Research Associate of the Division of Endocrinology, First Propaedeutic Department of Internal Medicine, Laikon Hospital of the National and Kapodistrian University of Athens, Greece. He has also served for many years as Research Associate at the Laboratory of Histology of the National and Kapodistrian University of Athens, Greece. Due to his dedication and active involvement in research and practice of Endocrine Pathology and Neuropathology, he is active member of many relevant Societies including the IAP, ESP, the Endocrine Pathology Society, the Pituitary Society, the International Pituitary Pathology and the European Network of Neuroendocrine Tumors. He has served as President of the Endocrine Society (2012-2014) and member of the Endocrine Pathology Working Groups of the European Society of Pathology, the Hellenic Society of Pathology and the Hellenic Society of Endocrinology. In 2014 he elected President Elect of the International Academy of Pathology (IAP) and two years later become President of the IAP (2016-2018). He has also served as Vice President (1998-2014) and member of the Education Committee of the IAP from 2011 to 2021. He has also served as President of the Hellenic Division of the IAP (2004-2016), President of the Hellenic Society of Pathology (1998-2002) and twice President of the International Pituitary Pathology (1998-2001 and 2009-2011). He has organized several International Congresses including the International Pituitary Pathology Meetings in Delphi (2001) and Santorini (2011) Greece, the XIIX International Congress of the IAP in Athens, Greece (2008) and the Intensive Courses in Pathology in Agria, Greece (2018, 2019 and 2022). He has encouraged the IAP Divisions of the Eastern European Countries, by helping the Russian, Romanian and Ukrainian Divisions to organize local Scientific Meetings, and also by giving lectures. He has interacted with the Arab Division and the Arab School of Pathology by giving several lectures in Jordan and Egypt and by organizing conjoint meetings with the Hellenic IAP Division. In addition, he has been personally responsible in motivating Turkish, Georgian and Serbian and North Macedonian pathologists to form their Divisions and joint the IAP. He has taken positive action regarding the IAP Goodwill Ambassador of the Visiting Professor Program to countries underserved in pathology in Turkey and Georgia (May and September 2013 respectively). He offered lectures, short courses, slides seminars and consultation cases, covering the topics of Endocrine Pathology and Neuropathology. He has published more than 138 original papers in peer reviewed Journals, 359 abstracts. His work has received 4653 citations according to the Research Gate (h-index 31), 3996 according to Scopus (h-index 31) and 1049 (h-index 36, i10-index 107) according to Google Scholar. In addition, he is principal and co-author in 14 chapters in books, including 5 chapters in the WHO Classification of Endocrine Tumors 2005 and another 5 chapters in the 2017 WHO Edition, and also in an Expert System in Pituitary and Sellar Tumors. He is also Editor in 25 CD and DVD-ROMS with Slide Seminars in Pathology As guest editor he has published one book edition and one double volume in Neuroendocrinology. He is Associate Editor of Frontiers in Endocrinology for Cancer Endocrinology and Editorial Board member of several Journals including Endocrine Pathology, Hormones, International Journal of Molecular Sciences, Gland Surgery, Journal of Immunoassay and Immunohistochemistry, EC Endocrinology and Metabolic Diseases, Pathologia, Molecular Neurobiology and Open Neuroendocrinology. He is also reviewer in 36 peer reviewed Journals. He has given many lectures in several countries including Australia, Austria, Brazil, Canada, Czech Republic, Colombia, Cyprus, Denmark, Egypt, France, Finland, Georgia, Germany, Greece, Hungary, Indonesia, Italy, Japan, Jordan, Netherlands, Madagascar, Pakistan, Poland, Romania, Russia, Spain, South Africa, Taiwan, Thailand, Turkey, Vietnam, UK, Ukraine and USA. He has awarded with several distinctions including the Gold Medal Award of the International Academy of Pathology (2018), the “George Papanicolaou” Award (2008) and the “George Papanicolaou” Prize (1992). He is recipient of MRC Grant, Canada (1993) and the ICRETT fellowship granted by UICC, Switzerland, (1993). The University of Toronto, Canada has nominated him for the “Bertha Rosenstadt” Professorship (1993). He is Member of Honor of the Romanian Academy of Medical Sciences (2002). Lastly, he ranked 5th in the “Top 100 Power List” of influential Pathologists, according to survey of “The Pathologist” Magazine (2015) and also among the “100 of the best, brightest, and most powerful advocates of pathology” according to survey of “The Pathologist” Magazine (2018).