Iliescu was born in Brașov, where he attended the Grigore Moisil National College of Computer Science.
[1] In 2003 he obtained a Ph.D. degree in psychology from the Babeș-Bolyai University with the thesis "Psychosocial Aspects of Organizational Change"[2] under the direction of Professor Horia Pitariu.
[8] He is currently an associate editor for the European Journal of Psychological Assessment and will serve a two-year term as editor-in-chief beginning on January 1, 2021.
[9] Iliescu has founded and managed businesses that use psychology applied in different settings to offer professional services.
In 2017, Illescu authored the book Adapting Tests in Linguistic and Cultural Situations, which was published by Cambridge University Press.