Zhelyo Zhelev currently works at the Department of Control and Analysis of Economic Activities at the D. A. Tsenov Academy of Economics. Svishtov. Zhelyo conducts research on tax control, tax fraud, tax evasion, tax avoidance, financial intelligence, and financial crimes. Zhelev has nine publications registered in the Scopus and WoS databases. He is a reviewer of over 80 scientific publications indexed in the same databases. Since 2025, he has been the supervisor of a master's thesis at the Azerbaijan State Economic University. Since 2024, he has been a reviewer of scientific projects at the Ministry of Education in Montenegro. He is a member of the Union of Scientists in Bulgaria and the Bulgarian Association of Experts for Counteracting Financial Crimes. Zhelyo Zhelev serves on the Editorial Boards of several international scientific journals, including Edelweiss Applied Science and Technology, the International Journal of E-Business Research (IJEBR), and the International Journal of Applied Management Theory and Research.