Howard J. Halpern, MD, PhD, specializes in medical imaging techniques, particularly focusing on low frequency-imaging-electron paramagnetic resonance (VLF-I-EPR). This technique enables the measurement of changes in oxygen content within tumor tissues, a crucial factor in assessing response to radiation therapy. Dr. Halpern is a co-author of a textbook on free radical biology and serves as the principal investigator for the Oversight Committee of the Laboratory Training for Radiation Oncology Residents. His research interests include hypoxia and physiology in tumors, significantly contributing to the field of cancer biology.