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Johannes Zajc is a leading researcher in neurorehabilitation engineering, specializing in hybrid robotic systems for upper-limb recovery after stroke. His work centers on integrating ElectroMyoGraphic (EMG)-triggered functional electrical stimulation (FES) with passive exoskeletons to restore arm and hand function in stroke survivors. Zajc’s major contribution is the development and clinical validation of the RETRAINER system—a robotic hybrid assistance platform that enables patients to actively use their own limbs early in recovery. His most-cited paper, "A Robotic System with EMG-Triggered Functional Electrical Stimulation for Restoring Arm Functions in Stroke Survivors" (2021, 59 citations), reports a randomized controlled trial demonstrating the system’s efficacy. His earlier work, "A Hybrid Robotic System for Arm Training of Stroke Survivors: Concept and First Evaluation" (2019, 48 citations), established the foundational design and feasibility. Zajc’s research has been pivotal in advancing evidence-based rehabilitation, with his publications collectively cited over 140 times, underscoring his impact on the field. His efforts within the European RETRAINER project highlight a commitment to translating engineering innovations into tangible clinical outcomes for neurological patients.