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Toshihiro Tsumura is a pioneering figure in mobile robotics, best known for his foundational work on collision avoidance for autonomous systems. His research centers on real-time navigation, path planning, and active positioning for robots operating in complex, dynamic environments—from factory floors to three-dimensional spaces. Tsumura’s major contributions include developing a local approach to collision avoidance among multiple mobile robots using nonlinear programming, as well as a heuristic algorithm that modifies velocity vectors to prevent collisions in real time. These early works, published in 1990, remain influential, with his most-cited paper garnering 21 citations and a follow-up study earning 11. Tsumura also advanced active positioning methods for vehicles moving in 3D space, employing laser beams and corner cubes for precise localization—a technique with applications in agricultural and nuclear robotics. Additionally, his work on path planning for space manipulators introduced the Enhanced Disturbance Map to minimize dynamic disturbances to spacecraft attitude. Through these contributions, Tsumura has shaped the trajectory of autonomous navigation, offering practical solutions that continue to inform modern robotics research.