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Seungjoon Choi is a robotics researcher whose work spans several interconnected domains, including visual servoing, compliant manipulation, mobile robot control, and underwater robotics. His most influential contribution, an image-based visual servoing framework employing sliding mode control (2006, 28 citations), introduced a robust nonlinear controller capable of handling parameter uncertainties more effectively than classical approaches — a meaningful advance for camera-guided robotic systems operating in real-world conditions. Earlier in his career, Choi developed a variable remote center compliance device using elastomer shear pads for peg-in-hole assembly robots (2000, 18 citations), demonstrating a practical engineering solution for precision assembly tasks. He further extended his interest in compliant systems by designing a 6-DOF compliant wrist with integrated force/torque sensing based on a Stewart platform architecture. His work in mobile robotics produced a nonlinear observer-based trajectory tracking framework offering robustness to measurement noise and unmeasurable state estimation. More recently, Choi contributed to underwater construction technology by developing a 3D reconstruction method using 2D multibeam imaging sonar, addressing the challenges of high-turbidity aquatic environments. Collectively, his research reflects a sustained commitment to robust, sensor-driven control across diverse robotic platforms.