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Dr Marc Posner serves as the Medical Director of the Department of Radiation Oncology at Northwestern Lake Forest Hospital just north of Chicago. Originally from New York City, Dr Posner is Harvard trained and has over 17 years of experience practising as a Radiation Oncologist. His internship was completed in the University of Chicago Hospital system, followed by a residency at the University of California in San Francisco, serving as the Chief Resident in 1999.