Dr. Juan Arenas is board certified in internal medicine. He completed medical school and a residency as a general surgeon in Venezuela. After moving to the United States, he Dr. Arenas spent two years as a research fellow at Wake Forest in North Carolina, followed by a second residency in Internal Medicine at Texas Tech University.


Dr. Sarah Lester completed her broad-based Family Practice residency at the acclaimed John Peter Smith program in Fort Worth, completing her years of Texas-based education as a National Merit Scholar, a magna cum laude graduate of Texas A&M, and medical school at University of Texas Health Science Center (UTHSC) in San Antonio.


Guadalupe Regional Medical Group
Dr. Juan Arenas

Dr. Rubin Harris is board certified in internal medicine and has been practicing in the Central Texas area as a hospitalist for over 22 years. Dr. Harris believes GRMC is a great place to work because of the collegiality of the medical staff, the strong skill sets of the nurses, the engagement of the case managers, the responsiveness to requests and support of administration.


Dr. Zulfiqar Shah
Dr. Rubin Harris

Meet the Team

Guadalupe Regional Medical Center’s Hospitalists are physicians dedicated to the delivery of comprehensive medical care to hospitalized patients at GRMC. A hospitalist will round on ICU, Medical and Surgical patients daily.

The benefits of having hospitalists on staff include:

• Keep primary care physicians informed and coordinate patient care among all members of the hospital staff

• Closely monitoring patient’s progress and adjusting treatments as needed

• Rapid response to patient needs

• Ordering and reviewing tests, x-rays and other procedures

• Overseeing discharge from the hospital and assisting with the transition to the patient’s home


Dr. Zulfiqar Shah is board certified in internal medicine and leads the hospitalist team. Prior to joining GRMC, he was a military physician where he served in the U.S. Air Force for a total of eight years, four active, where he assumed various leadership roles. He brings a wealth of hospitalist experience from various hospitals over the years.



Dr. Sarah Lester