Harry Kerasidis, M.D.

Harry Kerasidis, M.D., known as the XLNTBrain’s “Brain Doctor,” is one of few elite neurologists in the world specializing in the impairment of cognitive and emotional performance resulting from concussions. He co-founded XLNTBrain LLC after 25 years of clinically treating mild traumatic brain injury and studying the changes of the electrophysiology of the brain as it relates to behavior, cognitive, and emotional function resulting from various brain trauma, including concussions.

Dr. Kerasidis has treated thousands of concussion injuries throughout his career. His private practice, Chesapeake Neurology Associates, is based in Prince Frederick, Maryland. A highly sought-after cognitive neurologist, he has helped patients with a variety of cognitive and behavioral disorders including cognitive impairment due to stroke, sleep deprivation, attention deficit disorder, dementia, and traumatic brain injury.

Through his experience, Dr. Kerasidis sought to fill the void of a much needed comprehensive sport concussion management program. He found existing concussion baseline testing lacked critical cognitive and emotional measures. He also saw the gross lack of integration of key elements of a comprehensive sport concussion management program. So he created and began using a baseline assessment, acute management and recovery care plan, which has been incorporated into XLNTBrain’s complete concussion management program for all sports and levels.

Dr. Kerasidis has a distinguished career helping the general public, scholars and medical professionals understand the link between the physiology of the brain and behavior. At Calvert Memorial Hospital, he serves as the Medical Director for the Center for Neuroscience, Medical Director for the hospital’s Sleep Disorders Center and Medical Director for the hospital’s Stroke Center.


  • Licensed to practice medicine in the States of Maryland, and Virginia.


  • American Board of Psychiatry and Neurology
  • American Board of Sleep Medicine
  • Diplomat, National Board of Medical Examiners
  • Biofeedback International Certification Alliance


  • American Academy of Neurology
  • American Academy of Sleep Medicine
  • International Society for Neuronal Regulation


  • Hugh H. Hussey Award for excellence in teaching, 1990, as selected by the faculty of Georgetown University.


A graduate of Georgetown University School of Medicine, Dr. Kerasidis completed his residency in Neurology and Fellowship in Clinical Neurophysiology at the Georgetown University Hospital. Dr. Kerasidis’ professional interests include cognitive neurology, sleep disorders, and behavioral correlations of EEG and cognitive event related potentials.

1992 Fellowship

Clinical Neurophysiology, Georgetown University Department of Neurology

Training included clinical experience in epilepsy, including evaluation of medically refractory seizures for potential surgical intervention, intraoperative electrodiagnostic monitoring, evoked potentials, quantitative EEG analysis, topographical mapping, cognitive event related potential mapping, polysomnography and the diagnosis and treatment of sleep disorders.

Research included topographic mapping of EEG and cognitive event related potentials in temporal lobe epilepsy, and patients suffering from aphasia due to stroke, tumor or traumatic brain injury.

1991 Residency

Georgetown University Department of Neurology

Research: Laboratory neuroscience research investigating the effects of levodopa on serotonin metabolism. Techniques acquired include stereotactic brain lesioning, high performance liquid chromatography, and data analysis.

1988 Internship

Georgetown University Transitional Internship

Curriculum: General Internal Medicine (four months), Pediatrics (four months), Emergency Medicine (two months), General Surgery (one month), Pediatric Neurology elective (one month).

1987 Doctor of Medicine

Georgetown University School of Medicine

1982 Master of Science

Georgetown University Department of Physiology, Research: Behavioral Assessment of Traumatic Spinal Cord Injury

1981 Bachelor of Science

George Washington University


Dr. Kerasidis currently lectures and gives workshops internationally on quantitative EEG analysis and EEG biofeedback. He is a certified instructor for the EEG Biofeedback Certification International Alliance.


  • 1982 – 1983 Georgetown University School of Medicine – Teaching Assistant in Neurobiology.
  • 1982 Georgetown School of Nursing – Teaching Fellowship, Human Biology, Anatomy, and Microbiology courses.
  • 1979 George Washington University – Teaching Assistant in General Biology and comparative Anatomy.


  • H. Kerasidis, K. Gale, J.R. Wrathall: Spinal Cord Contusion in the Rat II: Behavioral Analysis of Functional Neurological Impairment. Abstract presented at the annual meetings of the Society of Neuroscience, October, 1994.
  • K. Gale, H. Kerasidis, J. R. Wrathall; Spinal Cord Contusion in the Rat: Behavioral Analysis of Functional Neurologic Impairment. Experimental Neurology, 88 (1985) 123-134.
  • H. Kerasidis, K. Gale, J. R. Wrathall; Behavioral Assessment of Functional Deficit in Rats with Contusive Spinal Cord Injury. Journal of Neuroscience Methods, 20 (1987) 167-189.
  • H. Kerasidis, P. Karstedt, R. Meloni, K. Gale, J. Pincus; Effects of Levodopa of Regional Brain Metabolism in Rats with Unilateral Destruction of Dopamine Pathways. Abstract presented at the annual meeting of the American Association of Neurologists, October, 1990.
  • M. P. Kolsky, R. Packer, H. Kerasidis; Miotic Pupils, Horizontal Gaze Palsy, Alternating Skew, Asymmetric Bobbing and Infiltrating Mononuclear Cells. Abstract presented at the annual meeting of the Frank B. Walsh Society, February, 1991.
  • H. Kerasidis, V. Starbuck, S. Potolicchio; Cognitive Evoked Potentials in Temporal Lobe Epilepsy. Abstract presented at the annual meetings of the American Neurological Association, 1992.
  • V. Starbuck; Topographic Mapping of the N400 Cognitive Event Related Potential in Aphasic Patients.Doctoral dissertation, Neuropsychology. Georgetown University, 1992.