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Kiyoshi Nagai is a distinguished robotics researcher whose career spans foundational work in multi-robot coordination and transformative contributions to rehabilitation engineering. His most influential research, beginning in the late 1980s, established the theoretical bedrock for understanding how multiple robotic mechanisms and multifingered robot hands coordinate forces during manipulation. His landmark 1989 paper on dynamics and stability in multi-robot coordination (335 citations) and his 1991 work redefining manipulating and grasping forces for multifingered hands (315 citations) remain seminal references in the field, with his 2005 mechanics paper (230 citations) further cementing this legacy. Nagai's work elegantly decomposed complex coordination problems into resultant and internal force components, providing engineers with practical frameworks for designing dexterous robotic systems. Beyond theoretical robotics, Nagai demonstrated a remarkable capacity to apply his expertise to human benefit, developing an 8-DOF robotic orthosis for upper limb assistance and contributing to stroke rehabilitation technology (248 citations). His interests extended to EEG-driven assistive robotics, exploring brain-machine interfaces for motor recovery. A committed educator, he also shaped robotics pedagogy through hands-on curriculum design. With nearly 1,400 citations across his key works, Nagai's contributions bridge elegant mechanical theory and meaningful real-world application.