Medical Team

Learn more about Scripps Proton therapy clinical and scientific team members, their expertise, and how they are among the best and most experienced in their field.

Experienced Proton Therapy Specialists

The expert radiation oncologists at Scripps Proton Therapy Center are among the best and most experienced proton therapy specialists in the world. Collectively, our proton therapy physicians have more than 90 years of expertise and are recognized leaders in proton treatment.


In addition, Scripps proton radiation oncologists participate in clinical research in proton therapy and have published numerous articles in peer-reviewed medical journals.


Our clinical and scientific team also includes the following proton treatment experts:


Scripps Proton Therapy Center Physician Team

Carl Rossi, MD

  • Carl Rossi, MD, medical director of Scripps Proton Therapy Center, has personally treated more than 9,000 prostate cancer patients with proton radiation over the last 24 years — more than any other physician in the world. Dr. Rossi has a research focus on the quality of life and cure rate in prostate cancer and lymphoma treated with proton beam radiation. He is certified by the American Board of Radiology, Radiation Oncology, 1994.


Huan Giap, MD, PhD

  • Huan Giap, MD, PhD, is the facility’s chief of breast, gastrointestinal and lung proton therapy. He is a Clinical Professor, Department of Radiation Medicine and Applied Sciences at University of California at San Diego, and is a medical physicist with a Ph.D. from the University of Texas M.D. Anderson Cancer Center. Dr. Giap has more than 18 years of clinical experience with various modalities of radiation therapy; he completed residency training in proton therapy and has treated hundreds of patients with proton therapy. His research focuses on developing and implementing advanced radiation treatments and clinical protocols to improve cancer cure rates and reduce side effects from radiation. He has been certified by the American Board of Radiology, Radiation Oncology, since 1999.


Ryan Grover, MD

  • Ryan Grover, MD, is the center’s chief of adult head and neck, central nervous system, sarcoma and gynecologic proton therapy. During the past 14 years, Dr. Grover has treated more than 1,000 patients. He has done extensive research on the use of proton therapy to make cancer treatment more comfortable and effective. He is certified by the American Board of Radiology, Radiation Oncology, 2008.


Patrick Linson, MD

  • Patrick Linson, MD, specializes in the treatment of prostate, lung, brain, head and neck cancers with proton therapy and a wide range of radiation treatment methods including intensity modulated radiotherapy (IMRT), image-guided radiotherapy (IGRT), Cyberknife stereotactic radiosurgery and Cyberknife stereotactic body radiation treatments. A Harvard-trained radiation oncologist with more than 20 years of experience, Dr. Linson’s research focuses on prostate cancer treatment and prevention strategies. He is the principal investigator on two prostate cancer treatment studies and continues to research prostate cancer prevention strategies. He is certified by the American Board of Radiology, Radiation Oncology, 2003.

Andrew Chang, MD

  • Andrew Chang, MD, is the center’s chief of pediatric proton beam therapy and a radiation oncology specialist with expertise in pediatric oncology. Dr. Chang has more than 15 years of experience and has treated more than 2,000 patients. He is certified by the American Board of Radiology in Hospice and Palliative Medicine; Radiology, 2012; and Radiation Oncology, 2008.

Atmaram Pai Panandiker, MD

  • Atmaram Pai Panandiker, MD is a radiation oncology specialist with expertise in pediatric oncology and proton beam therapy. He is certified by the American Board of Radiology, Radiology, 2012; and Radiation Oncology, 2008.