Marshall Scott Horwitz M.D., Ph.D.

 Marshall  Scott Horwitz M.D., Ph.D.


Dr. Horwitz’s laboratory employs genetic mapping and…

Read Full Bio

Patient Care Philosophy

My work, in the clinic and in the lab, is aimed at explaining the genetic origins of disease and applying that information to develop personalized approaches to cancer prevention and treatment.

Personal Interests

Travel, technology and world affairs.

Clinical Interests

Genetic diagnosis of medical disorders, with a particular emphasis on cancer predisposition syndromes.

Research Interests

Human genetics; cancer genetics; clonal evolution of cancer.


Univ. of Washington, School of MedicineMedical education1990
UW - Dept. of GeneticsFellowship
UW - Division of General Internal MedicineInternship
UW - Division of General Internal MedicineResidency


Board Certifications

American Board of Medical GeneticsClinical Genetics1996
American Board of Internal MedicineInternal Medicine1993
Dr. Horwitz’s laboratory employs genetic mapping and sequencing strategies to identify genes responsible for familial predisposition to leukemia, lymphoma, and bone marrow failure syndromes. The major focus of his research centers on defining the genetic origins of cancers of the blood and using that as a paradigm for further understanding development.

In related work, Dr. Horwitz’s laboratory has developed a new approach for mapping cell fate during development by inferring the order in which mutations accumulate in somatic tissues. Dr. Horwitz directs the University of Washington School of Medicine Medical Scientist Training Program (MSTP) for concurrent M.D./Ph.D. students. He is the cancer genetics section editor of the Public Library of Science journal PLoS Genetics and former chair of the NIH Genetics of Health and Disease study section. Among his honors, Dr. Horwitz is a recipient of the Presidential Early Career Award for Scientists and Engineers as well as an NIH Director’s Pioneer Award.

Provider Locations