Hematology

John Marshall, MD

Dr. Marshall received his training at Duke University, the University of Louisville, and Georgetown University. Dr. Marshall is an internationally recognized expert in new drug development for GI cancer, with expertise in phase I, II, and III trial design, and has served as Principal Investigator for more than one hundred clinical trials throughout his career. While he has an interest in many areas of cancer research, his primary focus is on the use of precision medicine in treating cancer. Dr.

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Credentials

Years in Practice

35+ years

Peer Recognition

Castle Connolly — Top Doctor
2007-2026 (20 years)
Healthgrades — Healthgrades Honor Roll

Clinical Focus

Subspecialties

Hematology & Oncology

Conditions & Treatments

Hematologic MalignanciesLeukemiaLymphomaMultiple Myeloma

Insurance(s) Accepted

Please verify your coverage with the provider — plan participation can change.

Practice Details

Hospital Affiliations

MedStar Georgetown University Hospital

Conditions Dr. Marshall treats

Insurance accepted

Frequently asked

Does Dr. Marshall accept Aetna insurance?

John Marshall's public profile lists Aetna, Anthem Blue Cross Blue Shield, and Blue Cross Blue Shield plus 6 more health plans as accepted plans. Plan participation can change — confirm directly with the practice before your visit.

Where does Dr. Marshall practice?

John Marshall practices in Washington, DC with hospital affiliations including MedStar Georgetown University Hospital.

What does Dr. Marshall specialize in?

John Marshall is a board-certified hematology specialist with focus areas in Hematology & Oncology.

How long has Dr. Marshall been practicing?

John Marshall has 38+ years of clinical experience in hematology.