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Kar-Han Tan is a pioneering researcher in cooperative robotics and human-robot interaction, best known for his foundational work on formation control. His seminal 1997 paper, "High Precision Formation Control of Mobile Robots Using Virtual Structures," has earned over 1,060 citations, establishing the virtual structure concept as a cornerstone of multi-robot coordination. This approach treats an ensemble of robots as particles embedded in a rigid virtual framework, enabling precise geometric configuration maintenance during movement—a critical challenge in cooperative robotics. Tan's subsequent 2002 paper further refined these control methods, influencing decades of research in swarm robotics and autonomous systems. More recently, he has advanced hand segmentation techniques for hand-object interaction using depth maps, addressing robustness issues in augmented reality and human-robot collaboration. His work on universal access to robotic resources also reflects a commitment to democratizing robotics, proposing standardized interfaces for remote robot operation. With over 1,300 total citations, Tan's contributions span from theoretical foundations to practical applications, making him a key figure in both cooperative control and interactive robotics.