We are deeply saddened by the passing of Dr. Mark Hallett, a world-renowned neurologist whose pioneering work transformed our understanding of movement disorders, including dystonia and spasmodic dysphonia.
Dr. Hallett served as Chief of the Human Motor Control Section at the National Institute of Neurological Disorders and Stroke (NINDS), where he dedicated more than 40 years to uncovering the origins of dystonia. Using tools such as TMS, EEG, PET, and fMRI, his team discovered that dystonia arises from both a loss of inhibition and abnormal brain plasticity, resulting in excessive and uncoordinated muscle activity. His research illuminated how faulty neural control leads to involuntary movements and guided new directions for therapy and rehabilitation. Dr. Hallett’s patient-centered approach and his lifelong pursuit of understanding the root causes of dystonia continue to shape research and treatment today.
His pioneering discoveries not only deepened scientific understanding but also inspired generations of clinicians and researchers to seek better outcomes for those living with complex neurological disorders. His mentorship extended far beyond his own laboratory, shaping future investigators who continue to advance knowledge of the brain, movement, and the voice. Among them is Christy L. Ludlow, PhD, a leader in the voice-disorder community and the first Scientific Director of the National Spasmodic Dysphonia Association (NSDA), now Dysphonia International.
Dr. Hallett was a valued friend to our organization. He presented at symposiums, contributed articles to our newsletters, and guided key research collaborations and workshops. He served as a facilitator for the 2005 NIH/NIDCD-sponsored workshop on research priorities in spasmodic dysphonia and later played an instrumental role in the Dystonia Coalition, advancing the understanding of focal dystonias across multiple disciplines.
Those who had the privilege of knowing Dr. Hallett remember not only his intellect and scientific rigor but also his kindness. He was always willing to listen, learn, and engage with genuine curiosity. There was a quiet humility about him — a rare combination of brilliance and warmth that made colleagues, trainees, and patients feel truly heard. His presence brought calm insight, thoughtful respect, and a smile that could light up a room.
We extend our deepest condolences to Dr. Hallett’s family, friends, and colleagues at NINDS and beyond, as well as to the many fellows who trained under his guidance. His passing is a profound loss, but his impact will continue to resonate for generations. Dr. Hallett’s scientific contributions, mentorship, and compassion have shaped the field and will continue to inspire all who strive to advance knowledge with empathy and purpose.