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Our Physicians

John K. Hayes, Jr., MS, MD

Dr. Hayes has been performing Brachytherapy procedures since 1988 and has performed over 2000 implants. Dr. Hayes is a native of Provo, UT. He received a B.S. degree in Chemistry in 1977 (Cum Laude) and a M.S. degree in Physical Chemistry in 1980 from Brigham Young University. In 1983, Dr. Hayes graduated with his Doctor of Medicine degree from the University of Utah. He served his internship and residency in Radiation Oncology at the University of Utah from 1983-1988. Dr. Hayes is board certified in Radiation Oncology by the American Board of Radiology.

Roger S. Hansen, MD

Dr. Hansen is a native of Salt Lake City, UT.  He earned a Bachelor's degree from the University of Utah in 1992, and a Doctor of Medicine degree from Creighton University in 1995 where he graduated with Honors.  He trained in Radiation Oncology at the University of Arizona completing in 2000.  Dr. Hansen joined GammaWest Cancer Services in July 2000, and he has performed thousands of brachytherapy procedures since that time.  In addition to a busy clinical practice, he is active in training Radiation Oncologists from around the USA and Canada the techniques and rationale of modern brachytherapy implants.  His primary interests are prostate cancer, breast cancer, endometrial cancer, and cervix cancer.  He is board certified in Radiation Oncology by the American Board of Radiology.

C. Leland Rogers, MD

Dr. Rogers is a native of Kentucky. He received his undergraduate degree from Brigham Young University and returned home for medical school at the University of Kentucky where he graduated Cum Laude in 1986. Dr. Rogers completed a residency in Radiation Oncology at the University of North Carolina in 1991. He has been involved in clinical and academic practices, and is well known for his specialization in the treatment of Gynecologic and Central nervous system tumors. Dr. Rogers is board certified in Radiation Oncology by the American Board of Radiology.

Robert A. Harris, MD

Dr. Harris trained in Radiation Oncology at the National Cancer Institute in Bethesda, Maryland, from 1996-2000. He subsequently became an attending physician in that program, serving as the Radiation Oncology Service Manager at the National Naval Medical Center. In that role he helped start the first intensity modulated radiation therapy (IMRT) program in the Washington D.C. Metropolitan Area. Upon completion of his Naval service in 2004, he relocated to Utah bringing with him a wealth of experience in using modern radiation therapy techniques, which have been shown to improve treatment outcomes and minimize side effects. Dr. Harris is board certified in Radiation Oncology by the American Board of Radiology.

Prior to his training in Radiation Oncology, Dr. Harris earned a B.S. degree in Chemical Engineering from Brigham Young University in 1988, and his medical degree from the Uniformed Services University of the Health Sciences in 1992. He completed an internship at the Naval Hospital in San Diego, California in 1993. From 1993-1996 he served as an Undersea Medical Officer at the Submarine Medical Research Laboratory in New London, Connecticut. He is also board certified in Undersea and Hyperbaric Medicine by the American Board of Preventive Medicine.

Ray S. Richards, MD

Dr. Richards was born in New York City. He graduated Cum Laude from Brigham Young University in Chemical Engineering and earned his Doctor of Medicine degree from the University of Utah in 1985. Dr. Richards completed an Internship in Internal Medicine at St. Joseph’s Hospital and Medical Center in Phoenix and then trained in radiation oncology at Loma Linda Medical Center in California. Dr. Richards has practiced in St. George, Utah since 1990. Dr. Richards is board certified in Radiation Oncology by the American Board of Radiology.

Mark W. Reilly, MD

Dr. Reilly was born in Omaha, Nebraska. He grew up in Schenectady, New York. He graduated from Creighton University with a degree in physics in 1981 and earned his Doctor of Medicine degree from Creighton University in 1986. Dr. Reilly completed a residency in radiation oncology at the Medical College of Wisconsin in Milwaukee, Wisconsin. He practiced for two years in Lafayette, Louisiana when an opportunity to move to Utah arose, he took it and practiced radiation oncology in Provo, Utah at Utah Valley Regional Medical Center and Central Utah clinic for nearly 14 years. He practiced radiation oncology at the Sletten Cancer Institute in Grate Falls, Montana from 2006 through 2008, where he gained crucial experience as the director of radiation oncology and co-director with a neurosurgeon of the CyberKnife program. He has been with Gamma West since September 2008. Dr. Reilly is board certified in radiation oncology by the American Board of Radiology.

James W. Clarke, MD

Dr. Clarke is a Utah native, born and raised in Utah County. He completed his undergraduate studies with a B.S. in zoology from Brigham Young University in 2000. Afterwards, he and his family moved to Columbus, Ohio where he completed 9 years of medical training. He graduated from The Ohio State University College of Medicine in 2004. During his time there he developed a special interest in cancer medicine through clinical experiences, and through a laboratory research fellowship in cancer genetics that he was awarded.

Following medical school, he completed a one-year internal medicine internship at Riverside Methodist Hospital in Columbus. He went on to complete his residency in Radiation Oncology at the Arthur G. James Cancer Hospital at Ohio State. The James Cancer Hospital is one of only 40 National Cancer Institute designated Comprehensive Cancer Centers in the U.S., and is recognized as one of the top 20 cancer hospitals in the country by U.S. News & World Report. At Ohio State he gained valuable experience in a wide range of cutting edge radiation therapy technologies, including image guided-intensity modulated radiation therapy, stereotactic radiosurgery, and high dose rate brachytherapy. Dr. Clarke has been extensively involved with cancer research in the clinic and in the laboratory and has authored numerous scientific publications in the field.

In 2009 Dr. Clarke joined Gamma West and returned to his home state. He practices primarily in St. George and has been excited to contribute to the high level of care already available in Southern Utah.

Brandon Fisher, MD

Dr. Fisher is a radiation oncologist with Gamma West Cancer Services in Utah. He specializes in all forms of radiation therapy ranging from the traditional form of external beam irradiation to stereotactic radiosurgery, brachytherapy, and intensity modulated radiation therapy.  He preformed his residency in Philadelphia at Drexel University. Dr. Fisher sits on the Young Physicians’ Committee to the Board of Chancellors of American College of Radiation Oncology (ACRO).  He sits on the International Committee, African workforce with, the American Society of Radiation Oncology (ASTRO).   Brandon is an avid adventurer and humanitarian. He is the President of Radiating Hope, a non-profit he founded to provide radiation equipment and training to developing countries. He was a finalist for the American Society of Clinical Oncology (ASCO) Humanitarian Award.  He loves the outdoors and is a volunteer member of the Weber County Search and Rescue team.  His loves being a husband and father of three wonderful kids.

Thomas Skidmore, MD

Dr. Skidmore is a Utah native, born and raised in Salt Lake City. He completed his undergraduate studies  at Westminster College (Magnum Cum Laude) in 2002 and also played Varsity Soccer while there. Afterwards, he attended the University of Utah, School of Medicine graduating in 2007 with honors. During his time there he developed a special interest in cancer medicine through personal and clinical experiences, and through a small research grant he was awarded in between his first and second year.

Following medical school, he completed a one-year internship at Evanston Northwestern Healthcare on the north shore of Chicago, IL. He went on to complete his residency in Radiation Oncology at the Barrett Cancer Center at The University of Cincinnati. In Ohio he gained valuable experience in a wide range of cutting edge radiation therapy technologies, including image guided-intensity modulated radiation therapy, stereotactic radiosurgery, and high dose rate brachytherapy. He served as the chief resident in radiation oncology and also was awarded a HDR brachytherapy fellowship through the American Brachytherapy Society.