Rena D. Callahan, MD is a hematologist oncologist who practices in Santa Monica and Santa Clarita. As an associate clinical professor of medicine at the David Geffen school of medicine, she is active in the breast cancer research and treatment program. She is board certified in hematology and medical oncology and focuses exclusively on breast cancer.
Dr. Callahan is dedicated to providing patient-centered care, and including her patients in clinical decision making so that their individual goals are met. Dr. Callahan received her medical degree from the University of Pennsylvania School of Medicine, where she graduated Alpha Omega Alpha, with high honors. She completed her internal medicine and hematology/oncology training at UCLA. She received her Bachelor of Science degree in biology from Yale University. Dr. Callahan has spoken about the evolving treatment of breast cancer at both local and national meeting