Professor Wiesław Wiktor Jędrzejczak was born in Gdynia in 1947; he graduated from the 2nd General-Education Secondary School in his home town. In 1971, he graduated with distinction from the Faculty of Medicine of the Military Medical Academy in Łódź. He was granted an Award of the Minister of National Defence. He obtained a PhD degree in medical sciences in 1974 and a post-doctoral degree in medical sciences in 1978 while working at the Nuclear Medicine Department of the Warsaw-based Postgraduate Training Centre of the Military Medical Academy in Łódź (at the Central Clinical Hospital of the Ministry of National Defence in Warsaw). In the years 1975-1976, he completed a one-year post-doctoral training program at the National Naval Medical Center in Bethesda/Washington under a scholarship awarded by the US National Research Council. He was nominated the professor of medical sciences in 1990. He initially worked as a full-time clinician and was actively involved in the introduction of cancer chemotherapy (the first original Polish paper in this field of research was published internationally in 1976), and the monitoring methods of patients with hematopoietic system dysfunctions to Poland. He then extended his field of research to include experimental haematology (studies on genetically mutated mice) to discover regulatory function of T cells in haematopoiesis and the first disease caused by the absence of haematopoietic cytokines. He also determined the haematopoietic stem cells count in normal bone marrow. He and his team introduced bone marrow transplantation to Poland.
Professor Wiesław Jędrzejczak performed the first successful allogeneic and autologous bone marrow transplantations on 28.11.1984 and 15.05.1985, respectively. In 1993, he was given the award of the Foundation for Polish Science for his achievements in medical and natural sciences. In 1998, he completed his professional military service in the rank of colonel and became the Head of the Department of Haematology, Oncology and Internal Diseases at the Medical University of Warsaw. In the years 1996-2004, he presided over the Polish Society of Haematologists and Transfusionists, and worked as the national consultant in haematology between 2002-2014.
He holds medical specializations in internal medicine, haematology, clinical oncology, and clinical transplantation. He has supervised 7 post-doctoral dissertations (Z. Pojda, C. Szczylik, MZ Ratajczak, G. Krzymański, A. Nowicki, A. Deptała, G. Basak) and 19 PhD dissertations. He has authored 130 publications as Wiktor-Jedrzejczak W and over 200 papers as Jedrzejczak WW, many of which have been published in high impact factor medical journals.