Gürkan Yildirim?is currently working as a full-time Associate Professor of Materials Science and Construction Materials in the Department of Civil Engineering of Hacettepe?University, Turkey and is affiliated with the Advanced Building Materials Laboratory of the same department. Prof. Yildirim’s research area of expertise encompasses a wide range of concrete technology, in particular, very ductile fiber-reinforced concretes known as strain-hardening cementitious composites (SHCCs) or engineered cementitious composites (ECCs). His work has mainly focused on the inherent ability of ECCs to recover their own damage (i.e.,?cracks) without any need of outside assistance through the mechanism known as autogenous self-healing. He has also engaged in studies related to detailed?fresh/mechanical/durability property characterization of ECCs, the utilization of nanomaterials in conventional and/or ECC-like composites for performance enhancement and improved self-sensing capability, and ductile composites for repair/maintenance applications. His latest research emphasis is placed on the effective recycling/utilization of construction and demolition (CDW) waste in alkali-activation and development of engineered geopolymer composites (EGC) based on CDW. Prof. Yildirim?is the author/co-author of 2 book chapters and more than 80 journal and conference papers, including 42 journal articles indexed by SCI/SCI-Expanded. He has acted as a reviewer for more than 25 scientific journals and is a Review Editor for the 'Journal of Frontiers in Built Environment – Construction Materials'. He was also involved in several national and international research and governmental projects funded by several authorities (i.e., the Ministry of Environment and Urbanization, TUBITAK, the British Council, and the European Commission). Most recently, he was awarded the prestigious Individual Fellowship of Marie?Sklodowska-Curie Actions (MSCA-IF-2019) funded by the European Commission to perform research at the University of Bradford, UK.