Skip Ribbon Commands
Skip to main content

About Us > Leadership

About Leadership

The NICoE leadership and staff are comprised of experts from across military medicine and academia, as well as clinical researchers with experience translating research into practice.

Sara M. Kass, M.D.

Sara M. Kass, M.D.
NICoE Special Assistant to the Commander
Walter Reed National Military Medical Center

CAPT Sara Kass is currently serving as Special Assistant to the Commander, National Intrepid Center of Excellence (NICoE), Walter Reed National Military Medical Center, Bethesda, Maryland. Prior to this position she was the Deputy Chief, Wounded, Ill and Injured, Bureau of Medicine and Surgery (BUMED), Washington, DC. Before reporting to BUMED she served as Faculty in the Department of Family Medicine and Director, University Family Health Center, Uniformed Services University.

CAPT Kass earned a Bachelor of Science Degree in Biology from Pacific Lutheran University in 1987. She attended Medical School at George Washington University and earned her Doctor of Medicine degree in 1992. Following medical school CAPT Kass received her training in Family Medicine at the Puget Sound Family Medicine Residency, serving as Chief Resident from 1994-1995.

CAPT Kass reported to Naval Air Facility Adak and served as Senior Medical Officer from 1995-1996. She reported to Submarine Base Bangor, Silverdale, Washington in 1996 to serve as Staff Family Physician. She assumed the duty of Senior Medical Officer of the Family Medicine Clinic at Submarine Base Bangor in 1997 and also served as Faculty at the Puget Sound Family Medicine Residency, Medical Student Liaison, and Senior Undersea Medicine Independent Duty Corpsman Supervisor. In August of 1997 CAPT Kass reported to Naval Hospital Naples as staff in the Family Medicine Department until August of 2000. During this time CAPT Kass served as Clinic Manager for the Family Medicine Department and Senior Medical Officer of Branch Clinic Capodichino. In 2000 CAPT Kass was selected to assist in the establishment of the fifth and newest Navy Family Medicine Residency at Camp Lejeune. This residency was accredited by the Accreditation Council for Graduate Medical Education in 2002.

CAPT Kass is a member of the American Academy of Family Physicians and of the Uniformed Services Academy of Family Physicians. She is a past recipient of the Society of Teachers of Family Medicine Resident Teacher Award.

James P. Kelly, M.D., FAAN

James P. Kelly, M.D., FAAN

Dr. James P. Kelly, a neurologist who is one of America’s top experts on treating concussions, serves as the director of the National Intrepid Center of Excellence (NICoE).

While serving as the NICoE’s Director, Kelly is on a leave of absence from his position as professor of neurosurgery and physical medicine and rehabilitation at the University of Colorado, School of Medicine. His past positions include assistant dean for graduate medical education at the University of Colorado, School of Medicine, and the neurology residency program director at Northwestern University Feinberg School of Medicine.

He has also served as director of the Brain Injury Program at the Rehabilitation Institute of Chicago, was the neurologist for the Chicago Bears of the National Football League and is consulted frequently by professional, elite amateur and youth athletes who have sustained concussions.

Kelly co-authored the sports concussion guidelines of the American Academy of Neurology and the Standardized Assessment of Concussion that is widely used in athletic and military settings. In addition, he is a fellow of the American Academy of Neurology and an examiner for the American Board of Psychiatry and Neurology; immediate past-president of the Colorado Society of Clinical Neurologists; and a consulting neurologist to the Defense and Veterans Brain Injury Center. He was the first chairman of the Defense Health Board’s Traumatic Brain Injury External Advisory Subcommittee for Military Clinical Care, Research and Education.

After attaining bachelor’s and master’s degrees in psychology from Western Michigan University, Kelly graduated from medical school at Northwestern University and completed his neurology residency and behavioral neurology fellowship at the University of Colorado.

Thomas J. DeGraba, M.D

Thomas J. DeGraba, M.D.
Deputy Director, Chief of Medical Operations

Thomas J. DeGraba, M.D., is the Deputy Director and Chief of Medical Operations at the National Intrepid Center of Excellence (NICoE) at the Walter Reed National Military Medical Center in Bethesda, Maryland.

Dr. DeGraba has worked as a leader in the field of neurology, with a focus in traumatic brain injury and stroke, for more than twenty years. Before working with the NICoE, he served as the Head of the Clinical Stroke Program at the National Naval Medical Center (NNMC) as well as a Staff Neurologist. He also served as Senior Staff Fellow and head of the Clinical Stroke Research Unit in the Stroke Branch of the National Institute of Neurological Disorder and Stroke (NINDS) at the National Institutes of Health (NIH).

While at the NIH, he established the first Intramural Clinical Stroke Program, directing research in the field of pathophysiological mechanisms of cerebrovascular disease related to inflammation and immuno-genetic susceptibility. During his time at the Department of the Navy and the Uniformed Services University of the Health Sciences (USUHS), he directed the Stroke Program of the Comprehensive Neuroscience Program and coordinated a collaborative clinical research team with members from the Department of Defense (DoD), NIH and private academic hospitals. He also directed the Cerebrovascular Laboratory which provided an essential resource of Transcranial Doppler to the brain injury team caring for severe head injured patients returning from Operation Enduring Freedom and Operation Iraqi Freedom. During his tenure at NNMC, Dr. DeGraba served as a neurological consultant for the Office of the Attending Physicians at the U.S. Capitol and the White House Medical Unit. 

Dr. DeGraba currently holds an appointment as an Associate Professor of Neurology at USUHS. He previously held an academic appointment as Assistant Professor at the University of Texas, Department of Neurology and served as Chief of Service at the Lyndon B. Johnson Hospital of the University of Texas -Houston Medical School. He earned his bachelor's degree in Biochemistry from the Catholic University of America, and his M.D. from Georgetown University. He completed his medical internship at the Washington Hospital Center, Neurology Residency at Georgetown University Hospital, and a post-doctoral fellowship in Cerebrovascular Disease at the University of Texas Medical Center, Houston.

As the Deputy Director of the NICoE, Dr. DeGraba helped to co-author the initial Concept of Operations for the center, which is designed to be a leader in the delivery of patient and family centric care to Service Members with complex unremitting combat related traumatic brain injury (TBI) and psychological health conditions and the advancement of the standard of care through engaging in world class research. He led the development of the Interdisciplinary intensive outpatient program utilizing state of the art evaluation techniques and treatment planning in a holistic integrative medicine environment designed to maximize patient provider interaction. He also guided the establishment of a research portfolio designed to more precisely characterize the pathophysiology and neural network disruption in service members with co-morbid TBI and psychological health conditions, in order to advance innovative diagnostic testing and pilot treatment studies.

Walt Greenhalgh, M.D

Walter Greenhalgh, M.D.
Chief of Clinical Operations

Captain Walt Greenhalgh is currently serving as Department Chief of Clinical Operations, National Intrepid Center of Excellence (NICoE), Walter Reed National Military Medical Center, Bethesda, Maryland. Prior to this position he worked for the Navy Medical Corps Chief as the Plans and Policy Officer, including a stint as acting Deputy Medical Corps Chief, Bureau of Medicine and Surgery (BUMED), Washington, DC.

Captain Greenhalgh earned a Bachelor of Science Degree (with distinction) in Microbiology and Immunology from McGill University, Montreal, Quebec, Canada in 1988, and then attended Medical School on a Navy Health Professions Scholarship at Thomas Jefferson University, Philadelphia, Pennsylvania, earning his Doctor of Medicine degree in 1992. Completing his internship in General Surgery at National Naval Medical Center, Bethesda, Maryland, CAPT Greenhalgh then received Flight Surgery Training in Pensacola, Florida, followed by orders as a Naval Flight Surgeon to the Naval Health Clinic, Quantico, Virginia. After his flight surgeon tour, CAPT Greenhalgh completed training in Family Medicine at the Puget Sound Family Medicine Residency, Naval Hospital Bremerton, Washington, serving as Chief Resident from 1997-1998.

Family Medicine staff tours included Naval Hospital Naples-Branch Medical Clinic Gaeta, Italy, where he assumed the role of Senior Medical Officer, followed by a tour as staff Family Physician at Naval Health Clinic Quantico, where he was the Director of Primary Care and Chairman of the Executive Committee of the Medical Staff (ECOMS). He then completed a tour as the first Navy Family Physician and Flight Surgeon at the US Air Force Flight Medicine Clinic, the Pentagon, before going back overseas to Naval Hospital Rota, Spain, serving as both Family Physician and Flight Surgeon, and also assuming the position of ECOMS Chair and Director of Medical Services.

After his Naval Hospital Rota tour, CAPT Greenhalgh was selected to attend the College of Naval Warfare, Naval War College, Newport, Rhode Island, where he received a Masters of Arts Degree in National Security and Strategic Studies. During his follow-on tour at BUMED, CAPT Greenhalgh deployed to Djibouti ,Africa, where he served as the Combined Joint Task Force-Horn of Africa Force Surgeon.

Captain Greenhalgh is Board Certified in Family Medicine and is a member of the American Academy of Family Physicians and of the Uniformed Services Academy of Family Physicians. His awards include the Defense Meritorious Service Medal (times two), the Meritorious Service Medal (times three), Navy/Marine Corps Commendation Medal, Navy/Marine Corps Achievement Medal (times two), and various unit and qualification ribbons. He is married to Heidi (Germer) Greenhalgh, and they have three children, Mark, Andrew, and Abigail.

Geoffrey G. Grammer, M.D.

Geoffrey G. Grammer, M.D.
Chief of Research

Colonel Geoffrey Grammer completed his Bachelor of Science in Biology at the Virginia Polytechnic Institute before beginning his training in medicine at the Uniformed Services University of the Health Sciences (USUHS) in Bethesda, Maryland, graduating in 1996. Subsequently, he completed residency in Internal Medicine and General Psychiatry at Walter Reed Army Medical Center, followed by a fellowship in Geriatric Psychiatry.

COL Grammer currently holds board certification in Psychiatry, Geriatric Psychiatry, and Behavioral Neurology and Neuropsychiatry. He is also currently an Assistant Professor of Psychiatry at his alma mater, USUHS.

COL Grammer has completed two deployments to Iraq, serving as the Medical Director for the 785th Combat Stress Control Company on his first deployment and as a Psychiatrist at the Combat Support Hospital at COB Speicher on his second. He has also deployed to Afghanistan as a Psychiatrist at the Combat Support Hospital in Bagram.
He served as the Chief of Inpatient Psychiatric Services at Walter Reed National Military Medical Center, which covers the 28 bed General Psychiatry and 6 bed Neuropsychiatry wards for eight years. In August of 2013, he assumed a position at the National Intrepid Center of Excellence (NICoE) as the Department Chief of Research.
COL Grammer’s military awards include the Bronze Star Medal, Meritorious Service Medal, Army Commendation Medal (3rd Award), Army Achievement Medal (3rd Award), Iraq Campaign Medal (3 Stars), Afghanistan Campaign Medal, Global War on Terrorism Service Medal, NATO ISAF Medal, National Defense Service Medal (2nd Award), Army Service Ribbon, Army Superior Unit Award and Overseas Service Ribbon (3rd Award).