Yi-Chieh Lee is an assistant professor in the Department of Computer Science at NUS Computing. Before joining NUS, he was a researcher at NTT, Japan. He earned his Ph.D. in 2021 from the University of Illinois Urbana-Champaign (UIUC). His research interests include human-computer interaction (HCI), CSCW, social computing, conversational user interfaces, and human-centered AI. He recently focused on designing AI conversational agents to promote mental well-being and behaviour change. He is passionate about bridging social impact and AI technologies; thus, he dedicates himself to creating new social interventions to facilitate human-AI interaction and generating recommendations for future technology design.