Gıyasettin Demirhan is working at Hacettepe University Faculty of Sport Sciences as a professor. He is Head of Physical Education and Sport Teacher Education Department. Also, he is a former president of Turkish Sport Sciences Association and former dean of Hacettepe University Faculty of Sport Sciences. He is a member of some international scientific association like AIESEP, ECSS, ICHPES, FIEP, WLO. He has been involved with photography and some outdoor-adventure sports like climbing, mountaineering, hiking, trekking and skiing for almost 40 years. Currently his research interests are critical thinking, instructional technology in PE and sports, relationship between physical activity and academic performance and cognitive process, risk perception in outdoor-adventure sports. He published 25 articles in international refereed journals and 46 articles in national referred journals. Also, he has two books and 13 book chapters in physical education and sport pedagogy. He presented more than 100 papers in international and national scientific congresses and completed 14 international and national scientific projects in his own research field. He was as keynote and invited speaker at many national and international scientific meetings. Also, he organized many international and national scientific meetings.