Dr. Beesley treats diseases of the brain, spinal cord, nerves, and muscles. Some of the more common problems that Dr. Beesley diagnoses and treats are strokes, epilepsy (seizures), headaches, dementias (Alzheimer's disease), multiple sclerosis, Parkinson's disease, chronic pain and a wide range of other neurological illnesses.

He is certified in neurology by the American Board of Psychiatry and Neurology (ABPN) and is a member of the American Academy of Neurology. He has participated as an investigator in numerous clinical trials and his expertise is in the subspecialty of neuromuscular disease and EMG. He is also an assistant professor of neurology.