Our Physicians

Our sleep centers are directed by Dr. Konrad W. Bakker and Dr. Marc Raphaelson. Both physicians are board-certified by the American Board of Sleep Medicine (ABSM) and in Neurology.

Konrad W. Bakker, M.D. graduated from the University of Amsterdam School of Medicine in The Netherlands in 1981. He performed rotating internships at the University of Leiden Medical Center in The Netherlands during 1981-1982. Dr. Bakker was a visiting fellow at the National Institutes of Health (NIH) in Bethesda, MD during 1983-1984. His then completed his residency program in Neurology at Georgetown University Medical Center in Washington, DC during 1984-1987. He is board-certified in Neurology with added qualifications in Neurophysiology by the American Board of Psychiatry and Neurology.

Dr. Bakker is board-certified by the American Board of Sleep Medicine (ABSM). In addition, he is board-certified in Electro Diagnostic Medicine by the American Board of Electro Diagnostic Medicine.

Furthermore, Dr. Bakker is an active member of the American Sleep Disorders Association, American Neurological Association, and the American Society of Neuroimaging. He holds a position of Clinical Instructor at Georgetown University School of Medicine and is one of the Medical Directors of Shady Grove Sleep Disorders Center in Rockville, MD. He is a staff member at Shady Grove Adventist Hospital, Loudoun Hospital Center, and Frederick Memorial Hospital.


Marc Raphaelson, M.D. graduated from the University of Pennsylvania School of Medicine in 1978. He went through his internship at the Presbyterian-University of Pennsylvania Medical Center in Philadelphia, PA during 1978-1979. He started his residency program in Neurology at Stanford University Medical Center in 1979, and he then later completed it at the National Institutes of Health (NIH) in Bethesda, MD in 1982. Dr. Raphaelson is board-certified in Neurology by the American Board of Psychiatry and Neurology with added qualifications in Clinical Neurophysiology.

Dr. Raphaelson is board-certified by the American Board of Sleep Medicine (ABSM). In addition, he is board-certified in Electro Diagnostic Medicine by the American Board of Electro Diagnostic Medicine.

Furthermore, Dr. Raphaelson holds an active membership in the American Society for Neuroimaging and passed its examination certifying competence in Neurosonology. He is one of the Medical Directors of the Shady Grove Sleep Disorders Center in Rockville, MD.
Dr. Raphaelson is a staff member at Shady Grove Adventist Hospital, Loudoun Hospital Center, and Frederick Memorial Hospital.