Professor Dr. Gueorgui Balatzenko received his medical training at the Medical University of Sofia and his PhD degree at the National Center of Haematology in 2002. He obtained additional qualifications at the Red Cross Blood Bank, Groningen-Drenthe, the Netherlands; Institute Paoli-Calmettes, Marseille, France; and Necker-Enfants Malades, Paris, France. He is Professor of Hematology and Blood Transfusion at the Laboratory of Cytogenetics and Molecular Biology at the National Specialised Hospital for Active Treatment of Haematological Diseases, Sofia, Bulgaria, teaching both undergraduate and graduate studies at the Sofia Medical University. His major interest is in the field of molecular investigations in leukemias. In regard to his scientific achievements, he worked on the elucidation of the incidence and clinical relevance of molecular biomarkers in chronic and acute leukemias as well as on the molecular monitoring of treatment response. Dr. Balatzenko has authored and coauthored many articles in peer-reviewed journals and book chapters. He is a member of several professional societies, such as the Bulgarian Society of Hematology, the Bulgarian Society of Genetics, and the European Hematology Association; a life member of the UICC; and a referee for international journals.