Rex Jung is an Assistant Research Professor of Psychology at the University of New Mexico, a research scientist at the Mind Research Network, and a practicing clinical neuropsychologist in Albuquerque, New Mexico. He studies both brain disease and what the brain does well—a field of research known as "positive neuroscience."

His research is designed to relate behavioral measures, including intelligence, personality, and creativity, to brain function and structure in healthy, neurological, and psychiatric subjects. He has published research articles across a wide range of disciplines, including traumatic brain injury, lupus, schizophrenia, intelligence, and creativity.

Rex was the President (2019-2021) of the International Society for Intelligence Research (ISIR).