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Harold L. Alexander is a robotics and control systems researcher whose career has centered on some of the most technically demanding challenges in space robotics, autonomous control, and sensor-based estimation. Working prominently out of Stanford University's Aerospace Robotics Laboratory and later the Laboratory for Space Teleoperation and Robotics, Alexander made foundational contributions to the control of space robotic vehicles, satellite manipulators, and free-flying unmanned systems during a pivotal era in robotics research. His most influential work addresses state estimation for distributed sensing systems with delay — a problem critical to real-world robotic applications where sensor data arrives asynchronously. This 1991 paper has accumulated 66 citations, reflecting its lasting relevance. His experimental work on satellite manipulator control (65 citations) further demonstrated practical advances in applying control theory to space systems. Alexander also pioneered vision-based navigation for free-flying robots, developing Kalman filter frameworks that enabled autonomous position and motion estimation from visual input alone. Later work explored robotic manipulation of sliding objects, expanding dexterous manipulation capabilities. Across his career, Alexander consistently bridged theoretical control methods with rigorous experimental validation, leaving a meaningful legacy in space robotics and autonomous systems research.