Professor Nicolae Ghilezan is one of the most well-known and appreciated Romanian doctors and researchers in the field of oncology, and especially radiotherapy. He played a decisive role for the appearance and development of this medical specialty in Romania. His competence and dedication is reflected both in specialized books and scientific articles, as well as in the work of the professionals he has trained over time.

After graduating from the Faculty of General Medicine from Cluj, he continued his specialization in radiology and oncology in Bucharest and in radiotherapy at the Institute „G. Roussy ” from Paris. He was also a visiting Professor in the USA in 1974. His Ph.D. thesis was on the treatment of laryngeal cancer. He had multiple academic and leadership positions at the Oncology Institute of Cluj (director 1997–2001) and at the University of Medicine and Pharmacy of Cluj-Napoca (scientific vice-rector 1990 – 1992).

He is currently a Professor Emeritus Consultant at the University of Medicine and Pharmacy. His research focused on clinical oncology, multidisciplinary approach of cancer, radiation dosimetry, radiobiology, medical informatics and evaluation of the quality of the medical act in the oncology services and radiotherapy. The results of his research can be found in numerous scientific papers, published nationally and abroad. He is a member of the Romanian Academy of Medical Sciences, of the Romanian Society of Oncological Radiotherapy, of the Romanian Society of Oncology, of the French Society of Oncological Radiotherapy, of U.S. Clinical Oncology Society, of the Society of Radiotherapy U.S. Oncology.