Halstead–Reitan Neuropsychological Battery (HRNB) refers to the first Neuropsychology laboratory in the United States which was founded in 1935 by Ward Halstead at the University of Chicago. Halstead worked closely with neurosurgery patients and developed assessment devices that differentiated between patients with and without brain damage. Halstead later developed, with Ralph Reitan, the HRNB, which represented an empirical approach to the assessment of brain damage.