Dr. Haller is a renowned expert in metabolic disorders of skeletal muscle and has authored more than 100 publications including articles in Science, the New England Journal of Medicine, and the Journal of Clinical Investigation. He has active scientific collaborations with investigators in Sweden and Denmark as well as in the United States. His research has centered upon metabolic and physiologic investigation of muscle disorders using exercise testing, magnetic resonance spectroscopy, and detailed biochemical analysis.

Dr. Haller joined the Institute for Exercise and Environmental Medicine at Presbyterian Hospital of Dallas in 1993. He graduated with honors from Stanford University and obtained his medical degree from the University of Washington School of Medicine in Seattle. His residency in neurology was accomplished at the Johns Hopkins Hospital in Baltimore and was followed by a research fellowship in neuromuscular diseases, also at Johns Hopkins.

A faculty member in the Department of Neurology and Internal Medicine at the University of Texas Southwestern Medical Center at Dallas, Dr. Haller served as chief of the neurology service at the Department of Veteran Affairs Medical Center and as vice chairman for VA affairs of the Department of Neurology, UT Southwestern. He is currently Director of the Neuromuscular Program at UT Southwestern and holds board certification in Internal Medicine and Neurology.