Professor Liu’s research interests cover several areas in dynamical systems and control theory, including hybrid systems, multi-agent systems, complex dynamical networks, differential equations with/without time delays, impulses, and stochastic disturbances, stabilization and synchronization, neural networks, modeling and control of infectious disease, congestion control of communication networks, and information security. He is the author or coauthor of 6 research monographs, over 300 research articles and over 20 edited books/conference proceedings.