Our Team
Erick D. Lopez, M.D.
Dr. Lopez completed a comprehensive fellowship in Sleep Medicine at Johns Hopkins University. He is also board certified in Internal Medicine with additional interest in obesity medicine, and preventative health. He completed his medical degree at the University of Texas Medical Branch in Galveston, Texas. Following this, Dr. Lopez moved to Albuquerque, New Mexico to complete his Internal Medicine training at the University of New Mexico Health Science Center. Dr. Lopez furthered his training by completing a comprehensive fellowship in Sleep Medicine at Johns Hopkins University. Dr. Lopez enjoyed participating in research, had multiple publications, and attended and presented at national, state, and local meetings. Dr. Lopez’s goals are to provide compassionate care and to help improve sleep health in his community for all ages. He is fluent in Spanish.
Robert S. Rosenberg, DO, FCCP
Dr Rosenberg, a graduate of Philadelphia College of Osteopathic Medicine, has over 30 years of experience in the field of sleep medicine, and is board certified in Pulmonary Medicine, Internal Medicine, and Sleep Medicine. He started his medical career as Associate Professor of Pulmonary Medicine at the Chicago College of Osteopathic Medicine teaching interns and residents pulmonary/critical care medicine at Phoenix General Hospital, and has published many articles and books on sleep. Dr Rosenberg served Havasu Regional Medical Center and at various Phoenix hospitals as the ICU Director as well as being the Medical Director of the former Sleep Disorders Center of Prescott Valley in Arizona.
Dr Rosenberg sees patients by Telemedicine only.
Richard P. Knudsen, M.D.
Dr Knudsen has a unique background with multispecialty training. He is board certified in Sleep Medicine and Neurology/Psychiatry and Neurophysiology and Pediatrics and Epileptology. He is published in various peer-reviewed resources. He is repeatedly invited to lecture at major Society gatherings. He is comfortable in offering care to all age groups. He received his undergraduate degree from the University of California. He completed his medical degree at the University of Cincinnati. Richard was double promoted in Pediatrics and finished his residency in that specialty at the University of California. He returned to Cincinnati and served as Chief Resident in Pediatric Neurology at the esteemed Cincinnati Children’s Hospital. Dr. Knudsen furthered his training with completion of a post-doctoral Fellowship- at the respected University of Pittsburgh -within the field of pediatric epileptology and discipline of advanced clinical neurophysiology. Dr. Knudsen has been focusing on Sleep Health with an integrative approach. He also speaks Spanish.
Aynur Okcay, M.D.
Dr Okcay completed a comprehensive Sleep Medicine Fellowship program at Mayo Clinic in Rochester, MN. The Center for Sleep Medicine at Mayo Clinic's campus in Minnesota is one of the largest sleep medicine facilities in the United States. She has extensive research background at Mayo Clinic focusing on cardiovascular aspect of sleep disordered breathing. Dr Okcay has published several papers and a book chapter and gave presentations in both USA and international Sleep Medicine Conferences. Having a Primary Care background, Dr Okcay realizes an inseparable relationship between healthy sleep and overall well-being. Dr Okcay listens closely to her patients to create a unique plan that will fit the individual patient's lifestyle and improve the quality of their sleep. She has special interest in Integrative/Functional Medicine so as to not only improve but also prevent health problems. She is originally from Turkiye; moved to USA as soon as she graduated from Medical School, and she completed all her advanced training in the USA for her residency and fellowship.
Sharon Bettinger, M.S., R.D., PA-C
Sharon completed her education in Physician Assistant studies with a Masters Degree at Midwestern University in Glendale, AZ. She also has her Bachelors Degree in Biology working with the Colorado Division of Wildlife while getting a Masters Degree in Nutritional Biochemistry. She is a Registered Dietitian who worked in both nutrition support and education at both Banner hospital and Mayo Clinic in Phoenix. As a Physician Assistant, she has been practicing primarily in Sleep Medicine in the beautiful Prescott area. ​She has a desire to provide integrative care in maximizing optimal sleep health for all patients.
Gregory Nelson, R.R.T.
Gregory Nelson is a Registered Respiratory Therapist specializing in CPAP and BiPAP. Gregory excels at providing his patients with the one-on-one care that enables them to be successful with their sleep therapy. Gregory also serves on the Board of Advisors for Pima Medical Institute. He has also hosted several classes for hospice nurses, teaching them about basic respiratory care relating to oxygen, and CPAP/BIPAP which has aided them with their continued education and patient care techniques. ​Gregory’s passion for patient care is what drives him to providing the most knowledgeable and personable one-on-one care. He strives to provide the best care possible at Arizona Sleep Center for many more years to come.