Chief Medical Officer

Dr. Billings serves as Associate Professor of Family and Community Medicine at Texas Tech University School of Medicine.  Medical students and family medicine residents routinely rotate with Dr. Billings, and he has been recognized with teaching awards from both Texas Tech University Health Sciences Center-Permian Basin and the University of Texas Medical Branch.  In 2015, the Texas Academy of Family Physicians honored Dr. Billings with the 2015 Exemplary Teaching Award for his work with precepting medical students.  In 2015, Dr. Billings also became director of the Texas Statewide Family Medicine Preceptorship Program. 
Dr. Billings currently serves as chief of staff of Big Bend Regional Medical Center, a critical access hospital, in Alpine, Texas.  Additionally, Dr. Billings serves as Co-President of the Presidio-Ojinaga Binational Health Council and as Medical Director for the City of Presidio Emergency Medical Services.




Dr. Katie Ray currently practices Family Medicine and Obstetrics in Marfa, Alpine and Presidio. In addition to a busy clinic practice, she delivers babies and cares for patients in the hospital. She has a special interest in women's health services, sports medicine and skin procedures. She heads a grant-funded program to provide free long-acting reversible contraception (IUDs and implants) to patients and training for residents about these devices. Additionally, she serves as Clinical Assistant Professor for medical students and residents with UTMB and Tech Tech Medical Schools.

Dr. Taylor McCain currently practices family medicine and obstetrics. She enjoys caring for patients of all ages in the Alpine, Presidio and Marfa clinics as well as Big Bend Regional Medical Center. She has a special interest in women's health. She graduated from Texas College of Osteopathic Medicine in Fort Worth, TX in 2015 and enjoys incorporating osteopathic manipulative medicine skills into her treatment plans. She then completed family medicine residency at McLennan County Medical Education and Research Foundation in Waco, TX. 


Provider FNP-C

Maritza Armendariz, is a Board Certified Family Nurse Practitioner, daughter of Frank Armendariz and the late Martha Rohana Armendariz. She is a 1984 graduate of Presidio High School returning to her hometown to begin working with the Presidio County Health Service.

“I’m excited to be back home and hope to be involved in our community.  I am passionate about helping others and it’s my personal goal to provide the best care possible and to help out in any way I can” Maritza said.



Dr. Edie Simmons is board certified in Internal Medicine and Nephrology, and practiced in Austin for 15 years before relocating to West TX to be closer to family.  She has expertise in the management of hypertension and kidney diseases, including caring for patients on dialysis and those with kidney transplants.  She was selected as a Top Doctor 2020 in Austin Monthly Magazine, and serves on the End-Stage Renal Disease Network of Texas.


She joined PCHS in Sept 2020, and practices Internal Medicine and Nephrology in Marfa, Presidio, and Alpine.  She has a special interest in kidney diseases and home dialysis.  She graduated magna cum laude from University of Mississippi Medical Center in 1997, where she also completed her Internal Medicine residency in 2001.  She completed her Nephrology fellowship training at Vanderbilt University in Nashville, TN in 2004.  She enjoys spending time with family, hiking, camping, gardening, and cooking.


Behavioral Health Counselors

Jacqueline Bow, LPC


Eleazar Cano, LPC

Alpine, Marfa, Presidio

Rogelio Zubia, LPC

Alpine Dental

Iris Korus, DDS


Tracy Cash

Dental Hygienist

Adriana Holguin

Dental Assistant