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Aaron M. Johnson is a roboticist whose research spans legged locomotion, robot morphology, dynamic manipulation, and the theoretical foundations of robotic motion planning. His early work on modular snake robot design (270 citations) demonstrated sophisticated mechanical and electrical architectures capable of achieving complex locomotive behaviors within tight engineering constraints. Johnson further advanced mobile robotics through the development of X-RHex, a highly capable hexapedal platform engineered for real-world sensorimotor tasks, and contributed foundational insights into reconfigurable robot morphology through the "Laboratory on Legs" architecture. A distinguishing thread in Johnson's career is his rigorous mathematical treatment of dynamic robot behavior. His work on hybrid systems models for manipulation, contact-implicit trajectory optimization using orthogonal collocation, and inertial appendage design for reorientation reflects a commitment to principled, generalizable frameworks rather than ad hoc solutions. His development of "self-manipulation" as a formal methodology and his vocabulary for legged leaping have meaningfully shaped how researchers conceptualize dynamic locomotion transitions. Johnson has also engaged with pressing ethical questions, co-authoring an influential examination of autonomous lethal robots and moral responsibility (107 citations). Collectively, his body of work — spanning over 900 cumulative citations — establishes him as a versatile and intellectually rigorous contributor to both the theory and practice of modern robotics.