Okan Esentürk received the B.S. degree in chemistry from the Middle East Technical University (METU), Ankara, Turkey, in 1996, and the Ph.D. degree in chemistry from the University of Maryland, College Park, MD, USA, in 2004. Since 2009, he has been a Professor with the Department of Chemistry, Middle East Technical University (METU). He was a Postdoctoral Fellow and then a Guest Researcher with the National Institute of Standard and Technology between 2004 and 2009 and worked under the guidance of Edwin J. Heilweil. His research interests include spectroscopy in hyperspectral imaging, light and matter interaction for better the understanding of the chemical characteristics of materials, determination dielectric properties of the materials in terahertz range, development of new methods and/or techniques based on spectroscopy for nondestructive testing of materials, ultrafast laser spectroscopy, and the study of photoconductivity with THz spectroscopy.