David McKenzie Rioch (July 6, 1900 – September 11, 1985) was a psychiatric research scientist and neuroanatomist, known for his pioneering brain research and for leading the interdisciplinary neuropsychiatry division at the Walter Reed Army Institute of Research (1951–1970), a program that contributed to the formation of the then-nascent field of neuroscience.W. Maxwell Cowan, Donald H. Harter, and Eric R. Kandel cited "the seminal roles played by David McKenzie Rioch, Francis O.