Gokhan Ozyigit graduated from Hacettepe University Faculty of Medicine (English) in 1996 and then obtained ECFMG Certification in the USA. In 2001 he completed his Residency at the Department of Radiation Oncology at Hacettepe University. He later became a Research Fellow at the Departments of Radiation Oncology at Washington University and The University of Texas M.D. Anderson Cancer Center. In 2004 he was appointed Assistant Professor at the Department of Radiation Oncology at Hacettepe University and in 2006 became an Associate Professor there. He is currently Chair at the Department of Radiation Oncology and Director of Advanced Cancer Technologies Research & Application Center at Hacettepe University. Dr. Ozyigit is an editorial board member of several international journals. He is also a reviewer or advisor for a number of other international journals, co-editor of seven previous books, and has authored numerous articles in peer-reviewed journals and book chapters. He received several national awards in the field of Oncology.He is a member of Board of Directors of Turkish Society for Radiation Oncology.