Dr. Castillo was born in the northern coast of Peru. He received his medical degree in Mexico City, and completed his Hematology and Oncology training at Brown University. After 5 years as an Assistant Professor of Medicine at Brown University, Dr. Castillo was appointed Assistant Professor at Harvard Medical School. His clinical practice and research interests at the Dana-Farber Cancer Institute focus on patients with Waldenstrom Macroglobulinemia. He is currently the principal investigator in a series of clinical trials evaluating highly effective non-chemotherapeutic approaches.