Bryan J. Traynor is a neurologist and a senior investigator at the National Institute on Aging, and an adjunct professor at Johns Hopkins University. Dr. Traynor studies the genetics of human neurological conditions such as amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). He led the international consortium that identified pathogenic repeat expansions in the C9orf72 gene as a common cause of ALS and FTD. Dr. Traynor also led efforts that identified other Mendelian genes responsible for familial ALS and dementia, including VCP, MATR3, KIF5A, and HTT.