COMPREHENSIVE CARE FROM AN EXPERIENCED AND DEDICATED TEAM.
Radiation Oncologists of Central Arizona, LLP (ROCA) are nationally recognized leaders in advanced radiotherapy and radiosurgery technology. Dedicated to providing the most effective, safe and evidenced-based therapy available, we have treated Valley residents for more than 20 years at the premier hospital-based cancer centers in metro Phoenix. The partnership we build with treating physicians, allows us to optimize treatment outcomes for your patients.
PHYSICANS | RADIATION ONCOLOGISTS
• JOHN J. KRESL, MD, PhD, FACRO, DABR | RADIATION ONCOLOGIST
• LAUREN D. STEGMAN, MD, PhD, DABR | RADIATION ONCOLOGIST
• THOMAS M. DANIELS, MD, DABR | RADIATION ONCOLOGIST
• KENNETH H. LUK, MD, FACR | RADIATION ONCOLOGIST
• THOMAS J. TAYLOR, MD | RADIATION ONCOLOGIST | RETIRED
• DEVIN J. SLOAN, MD, DABR | RADIATION ONCOLOGIST
• SANDRA S. ZAKY, MD, DABR | RADIATION ONCOLOGIST
• KURT A. WHARTON, MD, DABR | RADIATION ONCOLOGIST
• MARK MCLAUGHLIN, MD | RADIATION ONCOLOGIST
• Anderson Bauer MD | RADIATION ONCOLOGIST
• CHRISTINA DAVIS, PA | PHYSICIANS ASSISTANT
• LAUREN D. STEGMAN, MD, PhD, DABR | RADIATION ONCOLOGIST
• THOMAS M. DANIELS, MD, DABR | RADIATION ONCOLOGIST
• KENNETH H. LUK, MD, FACR | RADIATION ONCOLOGIST
• THOMAS J. TAYLOR, MD | RADIATION ONCOLOGIST | RETIRED
• DEVIN J. SLOAN, MD, DABR | RADIATION ONCOLOGIST
• SANDRA S. ZAKY, MD, DABR | RADIATION ONCOLOGIST
• KURT A. WHARTON, MD, DABR | RADIATION ONCOLOGIST
• MARK MCLAUGHLIN, MD | RADIATION ONCOLOGIST
• Anderson Bauer MD | RADIATION ONCOLOGIST
• CHRISTINA DAVIS, PA | PHYSICIANS ASSISTANT
THOMAS M. DANIELS, MD, DABR | RADIATION ONCOLOGIST
Dr. Daniels joined ROCA in 2008 and is member of the Cyberknife Society. He completed his residency at the Mayo Clinic in Rochester, MN, where he also served as Chief Resident. He earned his MD at Rush University Medical College in Chicago. Trained and experienced in the treatment of a variety of cancers, Dr. Daniels has contributed to numerous studies in clinical radiation oncology. He has experience in advanced treatment techniques including stereotactic body radiation therapy (SBRT) for lung, liver and Para spinal tumors, as well as frame-based and frameless stereotactic radiosurgery (SRS) for intracranial tumors. In addition, Dr. Daniels has extensive experience treating early-stage cancer patients with accelerated partial breast irradiation (APBI) using the SAVI, Contra and Ammonite Brach therapy catheters. On staff at Phoenix Children's Hospital, Dr. Daniels is a member of the American Society for Radiation Oncology, the Children's Oncology Group and the Pediatric Radiation Oncology Society. Dr. Daniels is Board Certified in Radiation Oncology by the American Board of Radiology.
JOHN J. KRESL, MD, PhD, FACRO, DABR | RADIATION ONCOLOGIST
Dr. Kresl is a nationally recognized expert in stereotactic radiosurgery and is frequently an invited lecturer at seminars throughout the world. Through his participation in Clinical Oncology Treatment Protocols, he offers the newest and most advanced forms of treatment for tumors of all disease sites.
An executive board member for the CyberKnife Society, he has published extensively on radiosurgery. Joining ROCA in 1998, he is the current Medical Director, as well as oversees the Department of Radiation Oncology at Banner Good Samaritan Medical Center. He was the Assistant Director for the Center for Thoracic Disease at St. Joseph's Hospital & Medical Center and Barrow Neurological Institute in Phoenix until 2008. Dr. Kresl completed advanced medical educational and research training in the field of oncology as one of five National Institute of Health (NIH) supported combined MD/PhD Fellow in Graduate Medical Science training in Molecular and Immunological Tumor Cell Biology. He received his MD and PhD from Northwestern University Medical School in Chicago and completed a comprehensive Radiation Oncology training program at the Mayo Clinic, Rochester, MN. Dr. Kresl has also completed advanced Clinical Radiation Oncology training in the field of Brachytherapy, GammaKnife™ Stereotactic Radiosurgery and CyberKnife® Stereotactic Radiosurgery. Dr. Kresl is Board Certified by the American Board of Radiology in Radiation Oncology. A distinguished fellow of the American College of Cancer Specialists, he is included in the Best Doctors in America 2011-2012 and was named among "America's Top Oncologists 2010" by the Consumer's Research Council of America.
KURT A. WHARTON, MD, DABR | RADIATION ONCOLOGIST

Dr. Wharton joined ROCA in 2010 and is based at Banner Thunderbird Medical Center and the Virginia Piper Cancer Center at Scottsdale Healthcare-Shea. He received his medical degree from the College of Human Medicine at Michigan State University in 2005. His advanced training in Radiation Oncology was completed at the University of Arizona Cancer Center where he served as the Chief Resident. He also received special training in prostate seed implants at the world-renowned Seattle Prostate Institute. He has published papers in the medical literature about the treatment of a breast cancer, prostate cancer and stereotactic radiation therapy for spine tumors. Dr. Wharton is board eligible in Therapeutic Radiology by the American Board of Radiology.
THOMAS J. TAYLOR, MD | RADIATION ONCOLOGIST | RETIRED
Dr. Taylor joined ROCA in 2001. The Medical Director of the Department of Radiation Oncology at Banner Desert Medical Center in Mesa, AZ since 1983, Dr. Taylor is a board certified therapeutic radiologist. Prior to his arrival in Mesa, he was a 10-year tenured faculty member at the University of Oklahoma. He is a member of the American Society of Therapeutic Radiology and Oncology (ASTRO), Arizona State Medical Association and Maricopa County Medical Society. Earning his medical degree at the University of Oregon Medical School, he interned at Good Samaritan Medical Center in Phoenix and completed his residency in Therapeutic Radiology the University of Oklahoma Medical School. He has been named a "Top Doctor" by PHOENIX Magazine.
DEVIN J. SLOAN, MD, DABR | RADIATION ONCOLOGIST
Dr. Sloan is Board Certified in Radiation Oncology, who received his Bachelor's of Science in Marine Biology and his medical doctorate at the University of Southern California. Before joining ROCA in 2011, he completed an internship in General Surgery at St. Luke's-Roosevelt Medical Center in New York City and served his residency in Radiation Oncology at both the University of Southern California and the University of Arizona. He has extensive training in intensity modulated radiation therapy (IMRT), stereotactic (body and brain) radiosurgery and brachytherapy.
KENNETH H. LUK, MD, FACR | RADIATION ONCOLOGIST
After graduating from UC Berkeley, Dr. Luk attended medical school at UC Los Angeles followed by a residency at Claire Zellerbach Saroni Tumor Institute in San Francisco. He completed a Fellowship at MD Anderson Medical Center in Houston, Texas. Dr. Luk is a Fellow of the American College of Radiology and Clinical Professor at the Midwestern University School of Medicine of Glendale, Arizona. Before moving to Phoenix, he held faculty appointments at UC San Francisco, University of Washington and UC Irvine. He is a member of the American Society of Therapeutic Radiology and Oncology and is a member of the American Society of Clinical Oncology. He served as the president of the American Endocurietherapy Society. Dr. Luk has published more than 60 peer-reviewed papers, abstracts and book chapters, and has been named a "Top Doctor" in Phoenix Magazine multiple times. He has a special interest in Intensity-Modulated Radiation Therapy (IMRT), Brachytherapy and treating patients with lung, colon and breast cancers. Dr. Luk is Board Certified in Therapeutic Radiology by the American Board of Radiology.
SANDRA S. ZAKY, MD, DABR | RADIATION ONCOLOGIST
Dr. Zaky came to ROCA in 2010. She received her Bachelor's of Science in Electrical and Biomedical Engineering at Marquette University, in Milwaukee, WI, followed by a Master's of Science in Immunology at Albany Medical College in Albany, NY. Her thesis focused on a novel treatment for hormone-receptor positive breast cancer. Dr. Zaky went on to receive her medical degree at Albany Medical College in 2005. After completing her residency in Radiation Oncology at Emory University, in Atlanta, GA, she gained extensive training in pediatrics, intensity modulated radiation therapy (IMRT), stereotactic (body and brain) radiotherapy and brachytherapy. Her interests include breast cancer, pediatric oncology and cancer survivorship programs, and she has been asked to speak at multiple national meetings regarding her research on triple negative breast cancer. Dr. Zaky is board eligible in Therapeutic Radiology by the American Board of Radiology.
LAUREN D. STEGMAN, MD, PhD, DABR | RADIATION ONCOLOGIST
Dr. Stegman joined ROCA in 2007 after completing his residency at the world-renowned Memorial Sloan-Kettering Cancer Center in New York City. He earned combined MD and PhD degrees from the University of Michigan in Ann Arbor, where he studied cancer gene therapy and molecular imaging. Published in numerous articles in both the basic sciences and clinical radiation oncology, Dr. Stegman is experienced in Brach therapy and IMRT for gynecologic, genitourinary, gastrointestinal, head and neck, thoracic, brain and breast cancers. He also has significant experience with stereotactic body radiosurgery for Para spinal, lung and liver tumors. He is Board Certified in Radiation Oncology by the American Board of Radiology. He has been named a "Top Doctor" by PHOENIX Magazine and Phoenix Woman Magazine.
MARK MCLAUGHLIN, MD | RADIATION ONCOLOGIST
Dr. McLaughlin is an Atlanta native, receiving his undergraduate degree from Duke University. He attended medical school at the Medical College of Georgia and completed his Radiation Oncology residency at the Shands Cancer Center at the University of Florida. He has been on the faculty at the Mayo Clinic and Wake Forest University, and he has practiced at St. Joseph's Medical Center/Barrow Neurological Institute in Phoenix, Arizona. In 2004, Dr. McLaughlin joined North Georgia Radiation Therapy. He has lectured nationally and internationally on his primary interests of brain, breast, prostate, and gynecological malignancies, and has published several articles and book chapters on oncology topics. Dr. McLaughlin has extensive experience in Intensity Modulated Radiation Therapy (IMRT), radiosurgery for brain and spine tumors, and brachytherapy including High Dose Rate (HDR) radiation therapy.
Anderson Bauer MD | RADIATION ONCOLOGIST
Dr. Bauer joined ROCA in 2012. He received his Bachelor's of Science degree from the University of Wisconsin-Madison followed by completion of medical school and Radiation Oncology residency at the Medical College of Wisconsin in Milwaukee. He has extensive training in intensity modulated radiation treatment, stereotactic radiosurgery, and brachytherapy. He has performed research in breast cancer, prostate cancer, malignant brain tumors, and quality improvement/patient safety. As a child of two cancer survivors, Dr. Bauer greatly values addressing the emotional needs of patients while providing up-to-date, high quality care. Dr. Bauer is Board-Eligible in Radiation Oncology by the American Board of Radiology.
CHRISTINA DAVIS, PA | PHYSICIANS ASSISTANT
Christina Davis joined Phoenix Cyberknife in 2011 with six years of Oncology experience. Three years of Medical Oncology experience where she was trained in treating a variety of Hematology and Oncology cancers utilizing a variety of chemotherapeutic agents. She was a co investigator in a variety of oncology clinical trials at Mayo Clinic and US Oncology. She has three years of Radiation Oncology experience treating adults and pediatrics. She is trained and experienced in providing patient care for all types of radiation therapy including Cyberknife, Brachytherapy, Stereotactic Radiosurgery, and Standard External Beam Radiation therapy for a variety of cancers. She is a native from Arizona and has worked all six years in the valley. She received her undergraduate degree from Arizona State University with a BS in Exercise Science followed by a Masters in Clinical Medical Sciences as a Physician Assistant from Barry University in Miami Shores, FL.
MEET OUR STAFF
• AMANDA THOMAS, BS RTT, RADIATION THERAPIST | CLINICAL ADMINISTRATOR
• Teddi Axne | THERAPIST
• JACQUE REIFF, RN BS | PATIENT CARE COORDINATOR
• Deirdre Colao RN, BSN, OCN | PATIENT CARE COORDINATOR
• KAREN ORTIZ, MA | MEDICAL ASSISTANT
• STACEY AIKINS, RTT | RADIATION THERAPIST
• COLLEEN O'BRIEN | PRACTICE REPRESENTATIVE
• THERESA KILGORE, RN | PRACTICE REPRESENTATIVE
• VICTOR HOWARD, PhD | PHYSICIST
• STEVE MARTIN | RADIATION THERAPIST
• JOHN GRANSBERY | DOSIMETRIST
• MONICA BAKER | FRONT OFFICE ADMINISTRATOR
• Lauren Miranda | FRONT-BACK OFFICE RECEPTIONIST
• CINDY RODRIGUEZ | FRONT OFFICE RECEPTIONIST
• Trinity Flanagan | FRONT OFFICE RECEPTIONIST















