Welcome! The Huntington Study Group (HSG) is a non-profit group of clinical investigators from medical centers in the United States, Canada, Europe, Australia, New Zealand and South America experienced in the care of patients and families affected by Huntington disease and dedicated to clinical research of this hereditary disorder. The HSG focuses on the conception, conduct and communication of clinical research, including treatment trials and observational studies aimed at relieving the burden and slowing the progression of Huntington disease. Please see Clinical Trials and Observational Studies in Progress for the current HSG trials.