Sebastian Szmit graduated from the Military Medical Academy in Poland (2002). From 2002 to 2012 he worked at the Military Institute of Medicine in the (1) Emergency Department, (2) Department of Internal Medicine and Cardiology, (3) Department of Oncology. From 2012 to 2022 he was employed by the Department of Pulmonary Circulation, Thromboembolic Diseases and Cardiology as cardiologist consultant of the Department of Oncology at the European Health Centre Otwock. In December 2022 he was appointed the Head of the Department of Cardio-Oncology, Centre of Postgraduate Medical Education at the Institute of Hematology and Transfusion Medicine & Consultant of the Cancer Diagnostics and Cardio-Oncology at the Maria Skłodowska-Curie National Research Institute of Oncology (Warsaw, Poland). He is cardiologist & clinical oncologist.