S. van der Gaag works as a Physician Assistant in HagaZiekenhuis in The Hague. She has a masters degree in movement sciences and is a certified KNF lab technician. S. van der Gaag is part of the DBS team, the team at HagaZiekenhuis that specialises in deep brain stimulation. She also performs intra-operative neuromonitoring and is involved with neuromodulation (spinal cord stimulation). She works for the neurology and neurosurgery departments.