About
Mark A. Greenberger, MD, has practiced internal medicine in Highland Park and Lake Forest since 1990. He earned his MD from the University of Illinois College of Medicine in Chicago in 1986. His residency in Internal Medicine at Rush University Medical Center followed, completing in 1989. He holds board certification in Internal Medicine.
Dr. Greenberger served as Chairman and Vice Chairman of the Department of Medicine at Lake Forest Hospital. He completed his most recent term as Chief of the Department of Medicine at Northwestern Lake Forest Hospital in 2016. He holds membership in the American Medical Association, the American College of Physicians, the Illinois State Medical Society, and the Lake County Medical Society.
Education & Training
Undergraduate
Colorado College (graduated 1981)
Medical School
University of Illinois College of Medicine in Chicago (MD, 1986)
Residency
Internal Medicine, Rush University Medical Center (completed 1989)
Certifications
Who is Dr. Greenberger right for?
Dr. Greenberger is a strong fit for adults seeking a deeply experienced internist on Chicago's North Shore. Patients managing chronic conditions benefit from his decades of practice in the community. Those who value a physician with strong hospital leadership experience will find him well suited. His independent practice model lets him refer to top specialists across any network.
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Frequently Asked Questions
Dr. Greenberger specializes in internal medicine for adults. He has focused on this specialty in Highland Park and Lake Forest since 1990. His experience covers a broad range of adult health conditions and chronic disease management.
Yes, Dr. Greenberger holds board certification in Internal Medicine. He earned his MD from the University of Illinois College of Medicine in Chicago and completed his residency at Rush University Medical Center.
Dr. Greenberger earned his undergraduate degree from Colorado College in 1981. He then attended the University of Illinois College of Medicine in Chicago, earning his MD in 1986. He completed his residency in Internal Medicine at Rush University Medical Center in 1989.
Dr. Greenberger has held significant leadership roles in local medicine. He served as both Chairman and Vice Chairman of the Department of Medicine at Lake Forest Hospital. He also completed a term as Chief of the Department of Medicine at Northwestern Lake Forest Hospital in 2016.
Dr. Greenberger holds membership in several professional organizations. These include the American Medical Association, the American College of Physicians, the Illinois State Medical Society, and the Lake County Medical Society.
Yes, Dr. Greenberger follows his patients into Highland Park Hospital and Northwestern Lake Forest Hospital. He also provides care at local rehabilitation facilities. This continuity means patients have their own physician guiding their care during hospitalizations.
Yes, Dr. Greenberger makes himself available to patients after hours for urgent issues. Patients can contact him directly rather than navigating an answering service. The practice returns calls promptly.
Doctor profile last updated March 21, 2026