Marie A Hollenhorst, MD, PhD

Dr. Hollenhorst is a physician and scientist with expertise in non-malignant hematology, transfusion medicine, and chemical biology. Dr. Hollenhorst values the one-on-one relationships that she forms with her patients, and strives to deliver the highest quality of care for individuals with blood diseases. Her experience caring for patients drives her to ask scientific questions in the laboratory, where she aims to bring a chemical approach to the study of diseases of hemostasis and thrombosis.

Dr. Hollenhorst pursued combined MD and PhD training at Harvard University, where she received a PhD in Chemical Biology under the mentorship of Professor Christopher T Walsh. She subsequently completed a residency in Internal Medicine at Brigham and Women's Hospital, a fellowship in Transfusion Medicine at Harvard Medical School, and a fellowship in Hematology at Stanford. 

Dr. Hollenhorst has an interest in the biology of platelets and coagulation factors which regulate a healthy balance between bleeding and clotting. At Stanford, Dr. Hollenhorst worked in the lab of Professor Carolyn Bertozzi, studying sugar molecules (glycans) found on the surface of platelets that are important in controlling their function and lifespan. Dr. Hollenhorst’s research laboratory at Brigham and Women’s Hospital and Harvard Medical School focuses on understanding sugar molecules (glycans) that help to regulate bleeding and clotting.