Tamer Hassen is a Professor of Pediatrics, Faculty of Medicine, Zagazig University, Egypt. He is an active member of the European Hematology Association (EHA), International Society of Pediatric Oncology (SIOP), and Egyptian Society of Pediatric Hematology and Oncology (ESPHO), and has attended numerous national and international pediatric and hematology conferences held by these organizations and others. He has been a guest speaker at numerous pediatric oncology and hematology meetings and has published more than fifty international research publications in pediatrics and pediatric hematology and oncology. Dr. Hassan has edited two books and authored four book chapters. He has participated in many professional trainings and workshops. He received international scholarships from EHA-HOPE Cairo in 2017 and 2018, and an award from SIOP in 2016. He has completed several international preceptorships, including a hemophilia preceptorship at Saint Luc Hospital, Brussels, Belgium, and an immune-thrombocytopenia (ITP) preceptorship at Dmitry Rogachev National Research Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russia. Dr. Hassan is an editor and reviewer for many journals, including Hemophilia, Medicine, Oncology Letters, Child Neurology, and more. He was a primary investigator in four international clinical trials and a sub-investigator for ten others.