I have 18 years of experience, and specialize in the field of radiation oncology with specific knowledge in the areas of brain tumors, radiosurgery and radiation injury. I have published on such topics as gliomas, metastases and spinal cord injury. I have testified on radiation injury. I introduced image registration with information-theoretic algorithms to radiation oncology. This has permitted the use of high-quality imaging studies to guide the direction of radiation to tumors and to protect normal tissues to an extent previously not deemed feasible.