Dr. Johnson is an attending oncologist at Massachusetts General Hospital and an Instructor in Medicine at Harvard Medical School. His clinical and research interests are in lymphoid malignancies, including all non-Hodgkin lymphomas, Hodgkin lymphoma, and chronic lymphoid leukemias.

Dr. Johnson attended Harvard Medical School and completed a residency in internal medicine at Massachusetts General Hospital as well as a fellowship in hematology/oncology at the Dana-Farber Cancer Institute. He is a member of the American Society of Hematology, the American Society of Clinical Oncology, the American Society of Transplantation and Cellular Therapy, and the Cancer and Aging Research Group.

Dr. Johnson's research focuses on addressing the supportive care needs and mitigating the therapy toxicity of patients with lymphoma, patients receiving cellular therapy, and lymphoma survivors. He conducts studies and clinical trials of interventions to enhance patient quality of life, therapy tolerability, and care delivery as well as improve the care of adults with aggressive lymphomas and integrate patient-reported outcomes into clinical trials of new treatments.