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Adolf Karger’s research centers on the geometry and kinematics of robot manipulators, with a particular focus on singularity analysis. His most influential work, "Singularity Analysis of Serial Robot-Manipulators" (1996, 50 citations), develops a theory for describing higher-order singularities in 6-degree-of-freedom serial manipulators using Lie algebra properties of screw spaces. Karger made key contributions to classifying singular configurations, distinguishing between removable and nonremovable singularities—a distinction critical for practical motion planning. His 1996 paper on nonremovable singularities (14 citations) and his 1995 classification of manipulators with only singular configurations (13 citations) further advanced understanding of kinematic constraints. Karger also explored curvature properties of 6-parametric manipulators (1989, 10 citations) and systematically treated special motions, including the Bennett mechanism. His work provides a rigorous geometric foundation for analyzing robot motion, helping engineers design manipulators that avoid problematic singularities. With a career spanning from the late 1980s to 2000, Karger’s theoretical contributions remain essential reading for researchers in robot kinematics and mechanism design.