Dr. Horodner attended medical school at the Univiersity of Arizona. He then trained in Internal Medicine at the University of California, Irvine. Dr. Horodner completed a fellowship in Hematology/Oncology at UCLA Harbor General Hospital with distinction. Dr. Rowan Chlebowski, Chief of the Divison of Hematology/Oncology commented, "Andrew Horodner is one of the best oncologists we have had at UCLA Harbor. Not only is he an exceptional physician but he is also a outstanding individual in so many ways." Dr. Horodner is expert in benign and malignant hematology. He has specialty interests in breast, lung, prostate, and colorectal cancer. Dr. Horodner is Chairman of the Tumor Board and Vice-Chair of the Oncology Committee at Torrance Memorial Hospital. He is an active member of the Tumor Board at Little Company of Mary Hospital. He also is a member of the Breast Cancer Conference at both Torrance Memorial Hospital and Little Company of Mary Hospital. Dr. Horodner is an instructor at UCLA Harbor.