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Akihisa Ohya is a pioneering robotics researcher whose work has fundamentally advanced autonomous mobile robot navigation, sensing, and localization. Based at the forefront of intelligent robotics, Ohya has made landmark contributions spanning vision-based navigation, LiDAR development, and sensor fusion techniques that continue to influence the field today. His most celebrated work, a vision-based navigation system enabling obstacle avoidance through single-camera vision and ultrasonic sensing, has accumulated over 230 citations, establishing foundational principles still referenced in modern autonomous systems research. Complementing this, Ohya led the development of ultra-small lightweight optical range sensors and compact 3D LiDAR systems, addressing critical practical challenges of size, weight, and cost that restrict real-world robot deployment across platforms ranging from ground vehicles to aerial systems. Ohya's research portfolio reveals a consistent drive toward practical, deployable robotics. His contributions to scan matching using laser reflection intensity, map-free image-sequence navigation, outdoor positioning via tree detection, and human-following behavior demonstrate remarkable breadth. His work on mobile manipulators further extended robotic utility into everyday human environments. With numerous highly cited publications across two decades, Ohya's cumulative impact has helped define modern standards in autonomous mobile robotics, making his body of work essential reading for students and practitioners in the field.