Our Physicians

Lori A. Coleman, M.D.
Kelly D. DeWitt, M.D.
Siavash Jabbari , M.D.
Sunanda Pejavar, M.D.

Barry Uhl, M.D.
P. Brian Volpp, M.D., MPH
Geoffrey Weinstein, M.D.
Phillip G. Zentner, M.D.

 


Lori A. Coleman, MD Lori A. Coleman, M.D.

Dr. Lori Coleman attended college at the University of California, San Diego where she graduated summa cum laude with a degree in biomedical engineering. She then completed medical school at the University of California, San Francisco. This was followed by an internship in San Diego at Mercy Hospital. Dr. Coleman returned to the University of California, San Francisco and completed a residency in radiation oncology.

She is Board Certified in Radiation Oncology. Dr. Coleman is the Medical Director of Radiation Oncology at Palomar Medical Center in Escondido, California. Dr. Coleman has been with X-Ray Medical Group Radiation Oncology (XRO) since 1998.




Kelly D. DeWitt, MD Kelly D. DeWitt, M.D.

Dr. DeWitt received her undergraduate degree in Chemistry from Vanderbilt University in Nashville, TN graduating cum laude in 1992. After completing her medical degree from East Tennessee State University in 1999 where she was selected as a member of the Alpha Omega Alpha Medical Honor Society she relocated to San Francisco, CA for her Intern year followed by residency at University of California, San Francisco.

Dr. DeWitt is Board Certified in Radiation Oncology. She joined X-Ray Medical Group Radiation Oncology after completing residency in 2004 and is currently based at Grossmont Hospital in La Mesa, CA. While she enjoys working with all types of cancer patients, her specialties include breast cancer, lung cancer, and stereotactic radiosurgery.




Siavash Jabbari, MD Siavash Jabbari, M.D.

Dr. Siavash Jabbari earned his Medical Degree at the University of Michigan, where he was inducted into the Alpha Omega Alpha National Medical Honor Society.  He was subsequently recruited to the University of California San Francisco for residency training where he served as chief resident. 

Upon completion of his residency, Dr. Jabbari practiced in Chicago while serving as Assistant Professor of Radiation Oncology at the Chicago Medical School.  He currently practices in San Diego, CA, where he serves as the radiation oncology Medical Director of the Lauryl Amtower Neuro-Oncology Program and Cancer Institute.   

As a devoted advocate for public health and cancer patients, Dr. Jabbari contributes regularly to several regional television and media outlets as an expert commentator and recurring guest.   His advocacy work also includes regional and national leadership positions in health policy, government relations, and charitable foundations.

Dr. Jabbari has published nine authoritative textbook chapters and 19 peer-reviewed journal articles in a wide range of cancers and advanced medical technologies, including for breast, head and neck, brain, spine, lung, cervical, and prostate cancers.   Dr. Jabbari is the current principle investigator of several on-going prospective clinical trials in oncology, and actively serves as an expert reviewer for several scientific journals.  He is a regular invited speaker for numerous regional, national, and international scientific and medical meetings, including as an invited speaker at the 2016 and the 2017 Australian and New Zealand Royal Academy of Radiology/Radiation Oncology  (RANZCR), and moderating the Presidential Symposium of the American Society of Radiation Oncology (ASTRO) 2009 annual meeting.  

Dr. Jabbari currently serves as an invited member of the American Radium Society (ARS)/American College of Radiology (ACR) Appropriateness Criteria Brain Committee, the authoritative international body for the formulation of expert evidence-based guidelines for the treatment of brain tumors.

Dr. Jabbari has been elected by San Diego physicians for San Diego Magazine’s “Top Doctor-Physicians of Exceptional Excellence” award in both 2016 and 2017.

Read Dr. Jabbari's curriculum vitae.

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Sunanda Pejavar, MD Sunanda Pejavar, M.D.

Sunanda Pejavar, M.D., completed her undergraduate degree at University of California, Berkeley, where she graduated Summa Cum Laude and Phi Beta Kappa with a dual major in Pre-Med and History, and a minor in Spanish. She then graduated from Yale University School of Medicine in 2006 as an AOA Medical Honor Society and Parker Prize recipient. She completed her residency in Radiation Oncology at University of California, San Francisco in 2011. Dr. Pejavar is Board Certified in Radiation Oncology.

Her medical interests include breast, gynecologic, and head and neck cancers, and state-of-the-art techniques such as intensity modulated radiation therapy, stereotactic radiosurgery for brain and body, and partial breast irradiation. She strives to be an advocate for her patients, and she strongly believes in a holistic approach to cancer care. Her personal interests include travel, dance, and yoga. Dr. Pejavar is a Partner with XRO and primarily practices at Sharp Memorial Hospital in the Outpatient Pavilion in San Diego.

Read Dr. Pejavar's curriculum vitae.

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Barry Uhl, MD Barry Uhl, M.D.

Dr. Uhl was born and raised in the Midwest. He attended college at St. Mary's University in San Antonio, TX receiving a B.A. in Biology. He returned home to the University of Nebraska School of Medicine for his medical degree, where he was also able to continue his oncology research at the Eppley Cancer Center and the Omaha V.A. Medical Center. Upon completion of medical school, he finished an intern year of Internal Medicine at UNMC. This was followed by a residency in Radiation Oncology at Baylor College of Medicine in Houston, TX. At Baylor he was named Chief Resident his final year. Upon completion of his residency he joined X-Ray Medical Group Radiation Oncology in San Diego, CA.

Dr. Uhl is Board Certified in Radiation Oncology and serves as the Medical Director of Radiation Oncology at Sharp Grossmont Hospital and the Donna and David Long Center for Cancer Treatment. He is also a member of the Board of Governors for the Grossmont Hospital Foundation. While Dr. Uhl treats all manner of patients and cancer diagnoses, he specifically does research and speaking engagements regarding the use of Tomotherapy for Prostate Cancer, Head and Neck Cancer, and Stereotactic Body Radiation Therapy.

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P. Brian Volpp, MD, MPH P. Brian Volpp, M.D., MPH

P. Brian Volpp, M.D., MPH completed undergraduate work at Princeton University where he graduated cum laude with a degree in history and a certificate in American Studies. He then pursued a dual M.D./MPH program, studying medicine in his adopted home state of Nevada and public health administration at Loma Linda University, where he was selected to the Delta Omega Honor Society.

He did his residency in Los Angeles, first in preliminary medicine at Cedars-Sinai Medical Center followed by radiation oncology training at Kaiser Permanente. Dr. Volpp is Board Certified and primarily practices at Palomar Hospital in Escondido.

Dr. Volpp has published research on spinal cord tumors and prostate cancer. Special interests include integrative and complementary cancer medicine as well as palliative care/pain management. Dr. Volpp is board certified in both radiation oncology and integrative medicine.

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Geoffrey Weinstein, MD Geoffrey Weinstein, M.D.

Dr. Weinstein received his undergraduate degree in 1986 from Wesleyan University. He attended Baylor College of Medicine in Houston and was awarded his M.D. in 1990. After an internship at Mercy Hospital in San Diego, he returned to Houston for a radiation therapy residency at M.D. Anderson Cancer Center which he completed in 1995 and subsequently joined X-Ray Medical Group Radiation Oncology in San Diego.

Dr. Weinstein is Board Certified in Radiation Oncology and has served as the Medical Director of radiation therapy services at Sharp Memorial Hospital (SMH) since 2001. He assisted with the design of the new radiation therapy department at the Outpatient Pavilion at SMH which opened in 2003. While Dr. Weinstein enjoys all facets of radiation oncology, he specializes in prostate cancer (both IMRT and seed implants) and stereotactic radiosurgery.

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Phillip G. Zentner, MD Phillip G. Zentner, M.D.

Phillip G. Zentner, M.D. graduated from Vanderbilt University School of Medicine in 1990. He completed his residency in radiation oncology at Columbia-Presbyterian Medical Center in 1994 and is Board Certified. His medical interest include the treatment of head and neck cancers with IMRT as well as the treatment of breast, lung, rectal, and prostate cancer.

He is currently president of XRO and is developing the technical advancements at the new Doug and Nancy Barnhart Cancer Center on the Sharp Chula Vista Medical Campus.



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Lori A. Coleman, M.D.
Kelly D. DeWitt, M.D.
Siavash Jabbari , M.D.
Sunanda Pejavar, M.D.

Barry Uhl, M.D.
P. Brian Volpp, M.D., MPH
Geoffrey Weinstein, M.D.
Phillip G. Zentner, M.D.