Dr. David Eisen is a pathologist practicing in Jacksonville, FL. Dr. Eisen is a doctor who specializes in the study of bodily fluids and tissues. As a pathologist, Dr. Eisen can help your primary care doctor make a diagnosis about your medical condition. Dr. Eisen may perform a tissue biopsy to determine if a patient has cancer, practice genetic testing, and complete a number of laboratory examinations. Pathologists can also perform autopsies which can determine a persons cause of death and gain information about genetic progression of a disease.