J. Mark Barnett, MD Medical Oncology / Hematology Locations: Locations Longmont Medical School Southern Illinois University School of Medicine, Edwardsville, IL Residency Internal Medicine, Brown University School of Medicine, Providence, RI Fellowship Hematology/Oncology, Brown University School of Medicine, Providence, RI Board Certification Medical Oncology Hematology Specialties Medical Oncology Hematology Breast Cancer Gastrointestinal Cancer Genitourinary Cancers Lymphoma