Dr. Borowitz is one of the leaders in applying immunologic techniques to diagnose and classify leukemia and lymphoma. He has published numerous articles documenting the importance of these ancillary studies in accurate diagnosis, and has been particularly active in applying sophisticated approaches using the technique of flow cytometry. He has also been a leader in standardizing the practice of flow cytometry as it applies to leukemia and lymphoma, and has worked on developing improved proficiency testing programs and guidelines as well as good laboratory practice.