Meet Our Leaders

Weslaco Regional Rehabilitation Hospital is led by a team of highly experienced healthcare professionals who are passionate about providing the highest level of care available to the hospital’s patients.

We invite you to learn more about us below:

Meet Our Leaders

Diana Schultz, Chief Executive Officer



Dr. Adam Muffler, Medical Director
Dr. Muffler is originally from Colorado. He earned his medical degree from the University of Texas Southwestern Medical Center in 2017 followed by a residency in physical medicine and rehabilitation at the University of Texas Southwestern Medical Center which he completed in 2021.

Dr. Muffler’s clinical interests include general medical rehabilitation (especially COVID-19), strokes, amputations, spasticity, and spinal cord injury. Other professional interests include patient education, transitions across various levels of care, providing cost-effective healthcare.

He is a father of four children who is heavily involved with their sports and extracurricular activities and can frequently be found with them at parks.


Dr. Juan David Asuaje, Associate Medical Director
Dr. Asuaje is passionate about helping individuals whose lives have been affected by disabilities caused by injuries, illnesses, or chronic medical conditions.

Board certified in family practice medicine, Dr. Asuaje brings more than 17 years of healthcare experience to his role. His extensive medical background includes family practice, general surgery, emergency care, transitional medicine, pediatric services, and rehabilitation.

Dr. Asuaje earned his medical degree in Caracas, Venezuela, from the Universidad Central de Venezuela Escuela de Medicina Jose Maria Vargas. He completed a family medicine residency at Earl K Long Medical Center in Baton Rouge, La.

Dr. Asuaje is a member of Texas Medical Association. When not working, he can be found cycling with his friends and enjoying outdoor activities with his family.



Rita Mata-Guerrero, Market Director of Nursing Operations
Rita’s passion for nursing and excellent patient care has been instrumental in the hospital’s excellent nursing outcomes. As a nurse for 23 years, Rita has plenty of hands-on experience serving patients and their families in rehabilitative care, management and obstetrics.

Rita earned an associate’s degree in nursing from the University of Texas at Brownsville and  bachelor of science in nursing and master of science in nursing with a concentration in nursing administration from The University of Texas at Arlington. She is a certified rehabilitation registered nurse and a  member of the Association of Rehabilitation Nurses.

Rita loves to spend time with her family, as her  twin boys fulfill her life beyond words.



Roland Cuellar, Director of Therapy Operations
Roland’s passion for rehabilitation has made a difference in his career and has been able to grow in his role at Ernest Health. He is eager to see each patient’s progress from needing total care and then walking our of the facility to go home to their families. He thrives in knowing the team will be able to make a difference in a patient’s life, to regain full independence when they have lost all hope.

Roland earned his Masters of Occupational Therapy from the University of Louisiana Monroe and is a member of the American Occupational Therapy Association.

Roland enjoys spending time with his family and his dog Zeus. He is also an active member of his church in Brownsville, TX.


David Castro
Director of Pharmacy


Landy Mendoza
Director of Patient Outcomes
Landelina is committed to the well-being of the patients. She brings that same compassionate commitment to supervising and directing the case management staff.

After teaching for nine years, Landelina made a career change to occupational therapy because she wanted to make a difference for patients who were recovering from disabling impairments. Now, nearly ten years later, Landelina has transitioned into case management as well and is still happy with her decision.

“It’s great to help somebody prepare for their return to the community,” she says. Landelina lives the quote, “Patients First!” as she believes there’s no better guide to directing each and every decision made daily when assisting patients.

Landelina earned a bachelor’s degree in 1994 from Pan American University in Edinburg, Texas and also maintains a lifetime teacher certification. She also earned a master’s degree in 2008 from the University of Texas – Pan American in Edinburg, Texas. She is a member of the American Occupational Therapy Association; certified by the National Board for Certification in Occupational Therapy; and is also certified by the Commission for Case Manager Certification.

In her spare time, Landelina spends time with her family, and supports Future Farmers of America and youth sports programs in her community.


Tony Rodriguez, Market Director of Human Resources



Art Gutierrez, Director of Plant Operations
Art brings more than 20 years of experience to his work in overseeing the hospital’s everyday maintenance to ensure the safety of the hospital’s physical building. 

Art earned an associate’s degree in applied science at Texas State Technical College, Harlingen, Texas, and then proceeded to earn another associate’s degree in respiratory therapy at Independence University online.

Art is married and enjoys fishing.


Faith Escobar, Director of Marketing and Business Development



Karen Ash, Clinical Compliance Specialist



Sonia Lopez, Health Information Management Manager



Carol Ybarra, Administrative Supervisor