Dr. Rena D. Callahan graduated from the University of Pennsylvania School of Medicine in 2004. She works in Valencia, CA and 1 other location and specializes in Hematology/Oncology. Dr. Callahan is affiliated with Henry Mayo Newhall Memorial Hospital, Huntington Memorial Hospital, Ronald Reagan UCLA Medical Center and Santa Monica UCLA Medical Center.
Medical School: University of Pennsylvania School of Medicine; Graduated 2004
*This physician has multiple office locations. See Office Information for details.