Anchorage: (907) 276-2400
Mat-Su Valley: (907) 745-2900
Gamma Knife: (907) 276-5555

Our Team

Meet Our Team of Dedicated Experts

We believe that the best cancer care is coordinated care. That’s why we have gathered together a team of highly trained medical professionals who will work together to plan and carry out your treatment.

Radiation Oncology Physicians

Richard T. Chung, M.D.

DR. Richard Chung, MDDr. Richard T. Chung, MD attended undergraduate school at Stanford University and medical school at the University of California, Los Angeles. In 1994 he completed his residency at Stanford in the field of radiation oncology.

Fascinated by Alaska, Dr. Chung relocated to Anchorage that same year to practice his passion – oncology – at the Anchorage Radiation Therapy Center. Since then, he has been a champion of bringing new radiation therapy technologies to the community so that patients and their families can receive cancer treatment close to home.

In 2006 Dr. Chung and the Anchorage Radiation Therapy Center opened a satellite facility to better serve the growing Mat-Su community.

In 2013, with the help of Dr. Stephen Settle, Dr. Chung brought in the Leksell Gamma Knife® Perfexion™, the most accurate and advanced radiosurgery technology available. And so began Alaska Gamma Knife Center at Anchorage Radiation Therapy Center.


  • Board Certified in Radiation Oncology by the American Board of Radiology (ABR).
  • Member of the American Society for Therapeutic Radiology and Oncology (ASTRO), American Society of Clinical Oncology (ASCO), American College of Radiology (ACR), and the Denali Oncology Group (DOG).


Stephen H. Settle, M.D., Ph.D.

Dr. Stephen H. Settle, M.D., Ph.D.After graduating from Stanford University with a PhD and earning his MD from Vanderbilt University School of Medicine, Dr. Settle completed his residency training at the MD Anderson Cancer Center. He was then recruited to a joint faculty position at MD Anderson and the Baylor College of Medicine, where he held dual appointments as an Assistant Professor.

In addition to treating patients with cancer, Dr. Settle conducted translational research on brain and spine tumors and served as the course director for resident doctors training in radiation oncology. While at MD Anderson, Dr. Settle developed expertise in stereotactic radiosurgery of the brain and spine, including the use of Gamma Knife to treat patients with intracranial disease.

Dr. Settle and his wife always dreamed of returning to their roots on the west coast, so when he was recruited as the Medical Director of the Alaska Gamma Knife Center, they jumped at the chance to move their four children to Alaska. Dr. Settle is spearheading the Gamma Knife® program at Anchorage Radiation Therapy Center which uses the latest cancer treatment technology, the Elekta Gamma Knife® Perfexion™, for non-invasive treatment of both cancerous and non-cancerous tumors and conditions in the brain.

"I am so thrilled to be working with Dr. Chung and Dr. Yordy to bring cutting-edge oncology care to Alaska. I really enjoy establishing a diverse practice, and bringing the skills that I've developed over the last two decades to help Alaskans with a variety of different cancers. The truth is, cancer treatment is currently undergoing a revolution, and using modern tools we are able to help the majority of patients."


  • Board Certified in Radiation Oncology by the American Board of Radiology (ABR).
  • American Society for Radiation Oncology (ASTRO)
  • The American College of Radiology (ACR)
  • Sigma Xi – The Scientific Research Society
  • Society for Neuro-Oncology
  • American Radium Society (ARS)
  • American Society of Clinical Oncology (ASCO)
  • Leksell Gamma Knife Society

John S. Yordy, M.D., Ph.D.

Dr. John S. Yordy, MD, PhD

Dr. Yordy is a graduate of the Medical Scientist Training Program at the Medical University of South Carolina, where he earned his M.D. and Ph.D. degrees. Following the completion of residency in Radiation Oncology at MD Anderson Cancer Center in Houston, Dr. Yordy joined the faculty at the University of Texas Southwestern Medical Center in Dallas, Texas, working as a physician scientist. He worked in the clinic as well as directed a translational research lab testing new drugs that could be combined with radiation therapy to make radiation treatments more effective.

Prior to medical and graduate school, Dr. Yordy was able to visit and experience many different parts of the world, as well as work in several interesting jobs.

"I traveled to Alaska three times before moving permanently to the Valley. I always wanted to live in Alaska and I am honored and feel fortunate to have joined Dr. Chung and Dr. Settle in delivering high-quality radiation therapy to anyone in need of this treatment. I look forward to a long-standing relationship with the community and treating patients with the highest level of care. From the time I was a child, I have always felt a calling to serve others. I am thrilled to be working in the Valley, continuing to follow my calling, and helping patients here that need radiation therapy." 


  • Board Certified in Radiation Oncology by the American Board of Radiology (ABR).
  • Member of the American Society for Therapeutic Radiology and Oncology (ASTRO), American Society of Clinical Oncology (ASCO), American College of Radiology (ACR), International Association for the Study of Lung Cancer (IASLC), and American Radium Society (ARS).


Aaron S. Kusano, M.D.,S.M.

KusanoDr. Aaron Kusano joins our practice as of August 3, 2015. He is a born and raised Alaskan, and after spending his years in Anchorage, Alaska he is a product of the distinguished Alaska WWAMI program- also known as Alaska’s Medical School. WWAMI is a collaborative medical school among universities in five northwestern states, Washington, Wyoming, Alaska, Montana, and Idaho and the University of Washington School of Medicine.

He received his medical degree from the University of Washington School of Medicine where he also completed his residency in radiation oncology. He completed his undergraduate degree at Johns Hopkins University, followed by his Master's degree in cancer epidemiology at the Harvard School of Public Health. During medical school he took a year off to complete a year-long fellowship in applied epidemiology at the Centers for Disease Control and Prevention in Atlanta, GA.

Dr. Kusano has published and given talks at national conferences focusing on safety and quality in radiation oncology. Recently he was the keynote speaker at the American Society of Radiologic Technologists Annual National Meeting, speaking on the importance of patient communication in cancer care. Alaska has always been his home, and he is ecstatic to be back. He looks forward to using his training and expertise within our practice, to provide compassionate and the highest quality of care to Alaskans. Welcome home Dr. Kusano, we are proud to have you as part of our Team.


Johns Hopkins University, Baltimore, MD
Bachelor of Science (BS) - 2000
Major: Biomedical engineering with electrical engineering focus
Minor: Mathematical sciences

Harvard University School of Public Health, Boston, MA
Master of Science (SM) -2004
Epidemiology with cancer epidemiology focus

University of Washington School of Medicine, Seattle, WA
Doctorate of Medicine (MD) - 2010


Centers for Disease Control and Prevention, Atlanta, GA
Applied Epidemiology Fellowship -2006/2007

Virginia Mason Medical Center, Seattle, WA
Transitional Internship -2011
University of Washington, Department of Radiation Oncology, Seattle, WA
Residency in Radiation Oncology - 2015


Medical Physicists and Dosimetry Staff

Medical Physicists and Dosimetry Staff

  • Bryan Jackson, MS, DABR- Chief Physicist
  • Sue Wirth, RTT
  • Noah Arvidson, MS
  • Bingqi Guo, Ph.D.
  • Kristie Holmes, BSRS, RT(R)(T)
  • Kara Charlick RT(T), MS

Radiation Therapists

  • Nancy Gray, RTT - Chief Therapist
  • Tanisha Herring, RTT
  • YoungJu Kim, RTT
  • Jennifer Stewart, RTT
  • Chelsea Holman, RTT
  • Paul Frechette, RTT
  • Lauren Hite, RTT
  • Dan Rivera, RTT - Valley Radiation Therapy Center
  • Alysia Quinlan, RTT - Valley Radiation Therapy Center

Oncology Nursing Staff

  • Diane Timmerman, RN
  • Julia Michaels, CMA
  • Jeff Carney, RN
  • Ana Maldonado, CMA - Valley Radiation Therapy Center
  • Muff Zellmer, ANP - Survivorship

Patient Care Coordinators

  • Mai Yee Thao - Supervisor
  • Yang Moua
  • Tanis Plaxton
  • Kameron Kron
  • Suzanne Willson- Valley Radiation Therapy Center
  • Pajai Thao- Valley Radiation Therapy Center

Practice Administrator

  • Kari Disbrow

Marketing Director

  • Diana Matukonis

Anchorage & Valley Radiation Therapy Centers

Phone: 907.276.2400
Toll-Free: 877.276.4655
Fax: 907.276.4888
Office Hours: Mon-Fri, 8am–5:30pm
[Map & Directions]

Phone: 907.745.2900
Toll-Free: 877.276.4655
Fax: 907.745.2999
Office Hours: Mon-Fri, 8am–5:00pm
[Map & Directions]