• Our People - Arta Monjazeb

The Department of Radiation Oncology's excellent service starts with our team of radiation oncologists, physicists, nurses, therapists, dosimetrists and other clinical staff working together to determine and deliver the ideal treatment for each patient. Our experienced and enthusiastic team members are dedicated to improving the health of our patients through safe and effective care.

Our multidisciplinary team works collaboratively to design an individual treatment plan for each patient. The treatment team typically includes radiation oncologists, medical physicists, radiation oncology nurses, radiation therapists and dosimetrists. However, depending on the type of cancer, other cancer center specialists may join the team as well.


Our radiation oncology experts bring their extensive education and experience to each patient, one at a time. We understand that every patient requires individual attention as each person and disease course is unique.

Richard ValicentiRichard Valicenti, M.D.
Chair of Radiation Oncology,
Areas of Specialty: prostate or other genitourinary (GU) cancers, prostate cancer brachytherapy, gamma knife

Megan DalyMegan Daly, M.D.
Areas of Specialty: breast, head/neck and lung cancers, lymphoma, stereotactic body radiotherapy (SBRT), intensity modulated radiation therapy (IMRT), and image guided radiation therapy (IGRT)

Ruben FragosoRuben Fragoso, M.D., Ph.D.
Medical Residency Director,
Associate Professor
Areas of Specialty: brain tumors, pediatric cancers, breast cancer, gamma knife

Arta MonjazebArta Monjazeb, M.D., Ph.D.
Areas of Specialty: colon, rectal, anal, stomach and pancreatic cancer, sarcoma

Shyam RaoShyam Rao, M.D., Ph.D.
Medical Director,
Associate Professor
Areas of Specialty:
head/neck, brain, lung, breast and skin cancers, intensity modulated radiation therapy (IMRT), image guided radiation therapy (IGRT), radiosurgery and stereotactic body radiation therapy (SBRT)

Jason ZhaoJason Zhao, M.D.
Assistant Professor
Areas of Specialty:
gynecologic (GYN), genitourinary (GU), gastroenterology (GI) and breast cancers, sarcoma

UC Davis faculty radiation oncologists frequently specialize in certain procedures or pursue specific fields of interest.  However, the listed specialties of the department faculty and physicians is only a sampling of their treatment areas.  If you do not see a specialty or interest below to match your diagnosis or concern, please call 916-734-1971 or 800-770-9275, Monday through Friday 8 a.m. to 5 p.m. for more information.