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Chae An is a pioneering robotics researcher whose work has fundamentally shaped our understanding of manipulator dynamics, parameter estimation, and force control. Working primarily in the mid-1980s through the 2000s, An made seminal contributions to the problem of automatically estimating the inertial parameters of robot manipulator links and loads during general movement. His landmark 1986 paper, "Estimation of Inertial Parameters of Manipulator Loads and Links," garnered an impressive 574 citations and established a foundational framework by recasting Newton-Euler equations to linearly relate measured joint forces and torques to inertial parameters — a technique that remains influential in robotics modeling today. His complementary 1985 works on rigid body link and load identification (218 and 88 citations, respectively) further cemented his reputation as a leader in dynamic modeling. An also made lasting contributions to force control stability, addressing the critical challenge of robots becoming unstable during contact with stiff environments. His proposals for open-loop joint torque control and adaptive gain-tuning strategies (224 citations) offered practical pathways to robust force control. Together, his body of work has provided robotics engineers and researchers with essential tools for accurate dynamic modeling and stable manipulation.