In the same year, he started his residency in Internal Medicine at Hacettepe University Faculty of Medicine, Department of Internal Medicine. He became an Internal Medicine Specialist in 1997. After the residency, he went to the United States in 1999 and did a minor in Clinical Medical Oncology at Roswell Park Cancer Institute, Buffalo, New York between 1999-2001. He became a Medical Oncology Specialist in 2001. He successfully passed all the required exams and received the American Oncology Board Certificate, and obtained the right to work as a medical oncologist in the USA.Between 2001-2002, he continued his studies in the USA until 2003, after completing his higher specialty in Stem Cell and Bone Marrow Transplantation in the same hospital.
Returning to Turkey Gazi University Faculty of Medicine in December 2003, he started working as a lecturer in the Medical Oncology Division. He became an associate professor in April 2004. He was appointed as a professor in 2009. He worked as the Chief Physician of Gazi University Hospital between August 2012-2013. Between 2014-2016, he served as the Deputy Dean of Gazi University Faculty of Medicine. Between 2012 and 2016, he served as the Head of Gazi University Medical Oncology Department.