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Fathi H. Ghorbel is a distinguished robotics and control systems researcher whose work has profoundly shaped the theoretical and practical foundations of robot manipulator control. His research spans adaptive control of flexible-joint manipulators, closed-chain mechanism modeling, harmonic drive gear analysis, and the mathematical properties of robot inertia matrices. Ghorbel's most influential contribution — his pioneering work on adaptive control of flexible-joint manipulators, accumulating nearly 200 citations — demonstrated through singular perturbation theory that rigid-robot adaptive control results can be extended to flexible-joint systems with a corrective damping term, an elegant insight that unlocked new control possibilities for compliant robotic systems. His subsequent stability analyses and adaptive integral manifold extensions further solidified this framework. His investigation into kinematic error in harmonic drive gears (149 citations) addressed a critical practical challenge in precision robotics and space systems, while his rigorous treatment of closed-chain mechanisms (164 citations) provided the field with essential reduced-order modeling tools applicable to parallel robots. Ghorbel also made fundamental mathematical contributions by examining the uniform boundedness of robot inertia matrices, clarifying an assumption widely taken for granted in the controls community. Collectively, his work bridges rigorous mathematical analysis with real-world robotic applications, making him an essential reference for researchers in advanced robot control.