Gonzalo Diaz, MD, FCCP, DBSM

Dr. Diaz received his training in sleep disorders medicine at the prestigious Montefiore Hospital at Albert Einstein School of Medicine in New York. He is trained in pulmonary medicine and has subspecialty certification in sleep disorders and pulmonary medicine. He served as Medical Director at Sierra Medical Center, Del Sol Medical Center, Providence Memorial Hospital and is currently Medical Director at El Paso Sleep Center.

Dr. Diaz is an AASM and ABIM-Certified Sleep Specialist and Associate Professor at Texas Tech University Health Science Center Paul L. Foster School of Medicine from the Department of Internal Medicine. He has a private practice focused on pulmonary medicine and sleep medicine and has taught fellows, medical students, resident physicians, respiratory/sleep technicians and students since 1985. He has published articles and is currently involved in clinical research in sleep disorders. His areas of special interest are obstructive sleep apnea, insomnia in adults and sleep disorders in children.


Omavi Bailey, MD, MPH

Dr. Omavi Bailey is a Somnologist, Epidemiologist, and Medical Doctor practicing pediatric and adult Sleep Medicine with board certifications from the American Board of Family Practice and the American Academy of Sleep Medicine. His depth of knowledge and enthusiasm about natural and novel treatments for chronic disease prevention influences his use of sleep as an intervention to prevent chronic illnesses. His unique and holistic approach to sleep medicine integrates traditional non-invasive ventilation therapy with cutting edge solutions such as oral appliance therapy, Hypoglossal nerve stimulators, natural weight loss and cognitive behavioral therapy for insomnia.

In addition to his clinical practice, Dr. Bailey’s commitment to scholarship is exemplified in his record of engagement in NIH-funded research, which has contributed to the publication of multiple articles on sleep and health disparities in peer reviewed journals such as the Journal of Clinical Sleep Medicine and others.

Dr. Bailey began his medical career in Havana, Cuba where he became fluent in Spanish and later received his MD from the American International School of Medicine. He completed his residency and fellowship training in Family Medicine and Sleep medicine at the University of Arizona where he was the first in the Department of Medicine to be awarded the prestigious NIH-funded K-12 Award in Sleep Medicine for his work on sleep and health disparities.  Additionally, he received certification in Integrative medicine with the Andrew Weil Center for Integrative Medicine that has contributed greatly to the incorporation of natural therapies in his sleep medicine practice.

Today, Dr. Bailey works in the state-of-the art El Paso Sleep Center where he bases his practice in providing patient-centered and holistic care in an underserved and culturally rich population at the Texas-Mexico border. He works tirelessly to provide his patients effective, natural, and cutting edge therapies to treat sleep disorders.

Needless to say, Dr. Bailey believes strongly in the evidence based power of sleep to heal and repair the body, and prevent chronic disease.


Dr.Maria Mendoza, DNP, FNP-C, APRN, MSN, BSN

Dr. Maria Mendoza received her Doctor Degree in family nursing practice in 2014 from the University of Texas at El Paso. During her Doctoral education program, Dr. Mendoza implemented a COPD order set based on standardized guidelines with eligible adult patients in an acute care setting in El Paso Texas. The use of the guideline resulted in no readmissions among the participants within 30 days of discharge.

Dr. Mendoza received her Master of Science in Nursing with a Family Nurse Practitioner concentration in 2008 from the University of Texas at El Paso. During her Masters program, Dr. Mendoza completed over 100 practicum hours in the specialty of pulmonary care under the direct supervision of a pulmonologist at El Paso Pulmonary Association. During this time, Dr. Mendoza committed herself to being part of the solution to alleviate the burden of chronic obstructive pulmonary disease. Dr. Mendoza received her Bachelor of Science in Nursing in 2004.

Dr. Mendoza is certified by the American Association of Nurse Practitioners, is a member of the American Academy of Sleep medicine, is a member of the Sigma Theta Tau International Honor Society of Nursing, a member of the Texas Nurse Practitioners Association, and a member of the El Paso Area Advanced Practice Nurses Association.

She has received numerous honors and awards, including Chancellors list during 2005-2006. In 2014 she was selected for the Paso del Norte Health Foundation Graduate Fellows Program award for academic excellence and leadership.

As part of the El Paso Sleep Center Medical Team, Dr. Mendoza  shares the goals of the team, to provide the highest possible quality care to all patients, and to share principles and values of a team-based care approach.


Dr. Monicke Magnon DNP, FNP-C, APRN, MSN, BSN

Monicke Magnon earned her Bachelor of Science degree in Nursing (BSN) from New Mexico State University in 2008. After a six-year hiatus from the academic world, she returned in 2014 to complete her Masters of Science degree in Nursing (MSN) with a Family Nurse Practitioner concentration at Texas Tech University Health Sciences Center in 2017.  She successfully passed the American Nurses Credentialing Center board certification examination in 2017, and in August of 2019, she joined the Doctor of Nursing Practice program at The University of Texas at El Paso where she utilized motivational enhancement therapy to improve CPAP compliance. 

In 2020, she was selected for the Paso del Norte Health Foundation Graduate Fellows Program award for Academic Excellence and Leadership.  She is a member of the Sigma Theta Tau International Honor Society of Nursing, a member of the American Association of Nurse Practitioners, a member of the Texas Nurse Practitioners Association, and a member of the American Academy of Sleep Medicine. 

After completing her BSN, she moved to Massachusetts, where she worked in several emergency departments across the state.  After six years, she returned to her hometown of El Paso, where she worked at the emergency department in the Hospitals of Providence Memorial Campus while completing her MSN.  She then began her career as a family nurse practitioner in sleep medicine at the El Paso Sleep Center. In 2020, she became responsible for managing all patients in El Paso implanted with Inspire, an upper airway stimulator that treats obstructive sleep apnea without a CPAP. She is the first provider in the state of Texas and New Mexico certified in Inspire’s Care Pathway. 

Monicke plans to stay in El Paso and use her newfound knowledge to improve her practice as a Family Nurse Practitioner at the El Paso Sleep Center to better serve the border community she calls home.  

Dr. Shahriar Shahzeidi

Dr. Shahriar Shahzeidi MD, FCCP

Pediatric Sleep Medicine Specialist

Graduate from University of Exeter in UK and holder of Diploma of Thoracic Medicine from university of London. Dr. Shahzeidi has his post doctoral education and fellowship training at the George Washington university affiliated hospitals. Dr. Shahzeidi is the winner of the Walden Nickens award and also Scientific achievement award from CNMC and George Washington University. Dr. Shahzeidi is Board Certified in Pediatric medicine, Pediatric Pulmonary, and Adult and Pediatric Sleep Medicine.

Dr. Shahzeidi is currently the medical director and director of sleep program at the Gran Health Institute (GHI) and has been serving as a committee member in American Academy of Sleep Medicine (AASM) since 2007. Dr Shahzeidi is also active member of speaker bureau in different academic institutions.

Dr Shahzeidi is a fellow member of AASM, AAP and ACCP and had numbers of publications in peer review Journals and academic institutions.

Dr. Shahzeidi’s interest is primarily in Pediatric Sleep disorders such as Insomnia in traumatic brain injuries of children, Parasomnia (Sleep walk, Sleep talk, nocturnal enuresis, head banging and bed rocking as well as bruxism ) which is a common phenomenon in patients with Autism, ADHD and Narcolepsy/ Cataplexy and behavior disorders. Also circadian rhythm disorders.

With over 24 years of experience, Dr. Shahzeidi is considered a highly regarded Pediatric physician with an emphasis in Sleep Medicine.


David F. Briones, MD, DLFAPA

Dr. Briones opened the first sleep disorders center in the El Paso region with Dr. Gonzalo Diaz in 1985. He is Founder of the Department of Psychiatry at Texas Tech University HSC-El Paso, where he served as Regional Chair for more than 25 years. Dr. Briones has authored more than 30 medical literature publications covering a wide range of topics. He continues to be very active in research, including current work in psychotic phenomenology, epidemiology, cross-culture medicine and sleep disorders.

He is Professor and Associate Chair of Psychiatry at the Texas Tech University Paul Foster School of Medicine, where he provides patient care and supervises the training of medical students and residents. He is certified in psychiatry by the American Board of Psychiatry and Neurology. Dr. Briones graduated from the University of Texas Medical Branch and received his specialty training in psychiatry at The University of Texas HSC-San Antonio.  In 2011 Dr. Briones was awarded the Distinguished Service Award at the annual meeting of the Texas Society of Psychiatric Physicians. He has been awarded Distinguished Life Fellow status, the highest achievement of the American Psychiatric Association.

Ronald Blumenfield, MD

Dr. Blumenfield earned his Medical Degree from the University of Illinois.  He served a General Surgery Residency at Wadsworth VA-UCLA before being chosen for an Otolaryngology Residency at the University Illinois Research and Educational Hospital.

He also was an American Academy of Ophthalmology and Otolaryngology Fellow, American Academy of Facial Plastic & Reconstructive Surgery Fellow, a clinical assistant professor at the Texas Tech School of Medicine and is a member of the American Academy for Otolaryngology Allergies.

Dr. Blumenfield enlisted in the United States Air Force and served from July, 1966 to July, 1968.  He earned an honorable discharge.  He serves as Chief of Staff at  Providence Memorial Hospital, where he is on the Board of Governors. Dr. Blumenfield serves as  President of the El Paso County Medical Society and Governor of the American Academy of Otolaryngology.


Joseph Arteaga, RST, RPsg.T., CSE. CCSH

Joseph graduated from the Stanford School of Sleep Medicine in 1985. He was one of the first 300 technologists in the United States to become a Registered Polysomnographic Technologist (R.Psg.T.). Joseph obtained his Registered Sleep Technologist (RST) credential 2011. In 2014, he acquired the Certified Clinical Sleep Educator (CSE) designation.

Arteaga is a member in good standing of the America Association of Sleep Technologist (AAST) since the 1986. Together with Dr. Gonzalo Diaz, M.D. they started the first Sleep Disorders Center in the El Paso area.

Joseph has been in the field of sleep medicine for over 30 years.  Prior, he gained expertise as a respiratory therapist, pulmonary technologist, EEG technologist and hyperbaric technologist as part of medical teams at several El Paso area hospitals.

Technical Staff

Patient Services

EPSC Logo Standard Icon


Facility Member


Since 1977, the American Academy of Sleep Medicine (AASM) Standards for Accreditation have been the gold standard by which the medical community and the public evaluate sleep medicine facilities. Achieving AASM accreditation demonstrates a sleep medicine provider’s commitment to high quality, patient-centered care through adherence to these standards.

Phone: (915) 779-7378

Referral Fax: (915) 779-2822