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Hirokazu Tabayashi is a pioneering researcher in humanoid robotics, best known for his foundational work at Waseda University on the development of bipedal locomotion and human-robot interaction. His most influential contribution, the paper "Humanoid Robots in Waseda University—Hadaly-2 and WABIAN" (2002), with 110 citations, details the design and control of two landmark robots: Hadaly-2, capable of expressive gestures, and WABIAN, a full-body humanoid that achieved dynamic walking. This work established key principles for stable bipedal gait and whole-body coordination that continue to influence modern humanoid platforms. Tabayashi also explored remote interaction between humans and humanoids (1999, 17 citations), investigating teleoperation and shared autonomy—early insights that anticipated today’s collaborative robotics. His research bridges mechanical engineering, control theory, and cognitive science, demonstrating how humanoids can serve as both tools for studying human movement and platforms for assistive technology. Tabayashi’s legacy lies in advancing the practical viability of humanoid robots, making him a key figure in the transition from conceptual designs to functional, interactive machines.