Cheng Xu is a Postdoctoral Research Fellow at the Web Information Retrieval / Natural Language Processing Group (WING) and the Centre for Trusted Internet and Community (CTIC) at the National University of Singapore (NUS), supervised by Assoc. Prof. Min-Yen Kan. He received his Ph.D. in Computer Science from University College Dublin (UCD), advised by Prof. M-Tahar Kechadi. His research interests focus on Trustworthy AI, benchmark data contamination in Large Language Models (LLMs), fake news detection, and misinformation governance.