Dr. Mehdi Riazi obtained his PhD in Applied Linguistics from the University of Toronto. He has supervised 50 master’s and 22 doctoral theses to completion. He has been the chief investigator for three research projects on test validation funded by IELTS, Pearson, and Educational Testing Service (the writing section of the TOEFL-iBT). 

He is the author of the Routledge Encyclopedia of Research Methods (Routledge, 2016) and Mixed Methods Research (Equinox, 2017), and more. His academic works have been cited 4,397 times by other researchers. He has an h-index of 33 and an ih-index of 63 according to Google Scholar.