Memorial Sloan Kettering pathologist Mark Ewalt

Mark D. Ewalt, MD


Clinical Expertise

Hematopathology; Molecular Pathology

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About Me


MD, Columbia University College of Physicians and Surgeons


Anatomic and Clinical Pathology – NewYork-Presbyterian Hospital/Columbia University Medical Center


Hematopathology - Stanford Healthcare; Molecular Genetic Pathology - Stanford Healthcare

Board Certifications

Anatomic and Clinical Pathology; Hematology (Pathology); Molecular Genetic Pathology

I am a pathologist who specializes in molecular genetic pathology and hematopathology. I also have an interest in developing new genetic tests for leukemia and lymphoma.

My molecular pathology work involves looking at mutations in samples from patients with cancer to diagnose, monitor, and help guide their therapies. This information also helps ensure each patient’s treatment plan is personalized to their unique cancer. As part of the Hematopathology Service, I integrate clinical and genetic information with microscopic and flow cytometry evaluation of patient tissues to diagnose blood cancers such as leukemia and lymphoma. 

My research is focused on identifying the genetic changes that drive leukemia and lymphoma to uncover prognostic and therapeutic markers.  This work dovetails with my clinical test development role in the Diagnostic Molecular Pathology Service.


Doctors at Memorial Sloan Kettering work as teams, with specialists from all different areas. This allows us to consider all your needs together, and to give you the best possible care.

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Clinical Trials

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Memorial Sloan Kettering's doctors and scientists are constantly developing new treatments for cancer. MSK is typically running hundreds of clinical trials at a given time.

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