Dr. Greenfield graduated with a BS degree in chemistry and microbiology as well as his medical degree from the University of Oklahoma. He completed his neurology residency and neurophysiology fellowship training at the University of Texas Southwestern Medical Center at Dallas.

Prior to moving to the Dallas area, he practiced neurology in Houston, Texas. Most recently, he has been on the faculty at the University of Texas Southwestern Medical Center and is currently affiliated with Baylor University Medical Center. In addition to general neurology, Dr. Greenfield has particular interest in the treatment of headaches, strokes and neuromuscular disorders.