Clinical interests for Dr. Callahan include chronic myeloid leukemia (CML), esophageal cancer, and lung cancer. Her professional affiliations include UCLA Medical Center, Santa Monica, Resnick Neuropsychiatric Hospital at UCLA, and Ronald Reagan UCLA Medical Center. She is an in-network provider for Anthem, Blue Cross/Blue Shield, and Blue Shield, in addition to other insurance carriers. Dr. Callahan graduated from the University of Pennsylvania School of Medicine. Her medical residency was performed at a hospital affiliated with the University of California, Los Angeles (UCLA). Her distinctions include: Yale Class of 1956, Summer Fellowship for Study Abroad; Commendation for Excellence in Medical Student Teaching, UCLA; and Russell J. Stumacher Memorial Award, for academic.