Dr Henry Hooker: Headache Research Dr Henry Hooker and the team at the Cumberland Neurology Group Headache Clinic take a special interest in the latest in headache research, as well as the discovery of the latest and most effective ways to relive chronic headache pain. Dr Henry Hooker is one of very few physicians in the United States and the world to specialize in this field, which has helped to make him a sought-after source for headache treatment and relief in the region.