Bogusław Maciejewski has completed his PhD at the age of 32 years and scientific title of a full professor in radiotherapy being 45 years old. He realized research projects in the UCLA Los Angeles, Gray Lab London, MGH Harvard Univ. Boston, MDACC Houston and other cancer centers in Europe. He was the director of Cancer Center – Institute Gliwice, Poland for 24 years, till 2015. He is author of over 200 papers published in reputed journals (IF = 1650, citation index = 3500). He awarded G.F. Fletcher Gold Medal, Gold Medal of Life Achievements in Oncology given by all European oncologic societies as he is a honorary member of American College of Radiology, radiotherapy expert of the IAEA in Vienna and for 10 years he was a member of European Board of Radiotherapy participating in the development European curriculum for radiotherapy. His major scientic interest is importance of treatment time and tumor repopulation and altered dose fractionation in clinical radiotherapy for human tumors.