About Us

Experience you can Trust

Lisa Davis, M.D., F.A.C.P. is a Doctor of Internal Medicine.

Doctors of Internal Medicine focus on adult medicine and have had special study and training focusing on the prevention and treatment of adult diseases. At least three of their seven (or more) years of medical school and postgraduate training are dedicated to learning how to prevent, diagnose, and treat diseases that affect adults. Internists are sometimes referred to as the “Doctor’s Doctor,” because they are often called upon to act as consultants to other physicians to help solve puzzling diagnostic problems.

What's an "Internist"?

Simply put, Internists are Doctors of Internal Medicine — Doctors for Adults. But you may see also them referred to by several terms, including “internists,” “general internists” and “doctors of internal medicine.” But don’t mistake them with “interns,” who are doctors in their first year of residency training.

Internists care for the whole patient.

Internists are equipped to deal with whatever problem a patient brings — no matter how common or rare, or how simple or complex. They are specially trained to solve puzzling diagnostic problems and can handle severe chronic illnesses and situations where several different illnesses may strike at the same time. They also bring to patients an understanding of wellness (disease prevention and the promotion of health), women’s health, substance abuse, mental health, as well as effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Our Team

Lisa Davis, M.D., F.A.C.P.

Dr. Lisa Davis is a native Texan. She has been in practice since 1989. Raised in San Antonio and Brownsville, she returned to San Antonio in 1995 to practice locally. Previously, she was with the Valley Diagnostic Clinic in Harlingen, Texas. She moved to her present location at 520 Camden in October of 2009.

She received her Medical Doctorate from the University of Texas Medical Branch in Galveston in 1986 and completed her Internal Medicine Residency at the University of Texas Health Science Center in Houston in 1989.  She is Board Certified by The American Board of Internal Medicine and is a Fellow of the American College of Physicians (F.A.C.P).

She enjoys reading, swimming, travelling with her husband, spending time with her family and playing with her dogs.

Hannah E. Heiligman, PA-C

Hannah is a native Texan, born in San Antonio and raised in Helotes. She obtained a Bachelor of Science degree in Chemistry with minors in Mathematics and Biology from St. Mary’s University. When Hannah wasn’t in the classroom, lab, or studying in the library you could find her playing softball for her Alma Mater, volunteering within the San Antonio community, or spending time with friends and family.

In 2019, she graduated from UT Health San Antonio with a Master’s degree in Physician Assistant Studies. During her training, she continued her passion of service and medicine through various volunteering opportunities around the San Antonio and south Texas communities.

Aside from pursuing a career as a PA in Internal Medicine, Hannah enjoys spending time with her husband, family and friends.

She enjoys being outdoors, playing volleyball, softball, or any other sport, running, hiking, and traveling.

Available Tuesday, Wednesday, Thursday, and Friday

Brittany G. Curry, FNP-C

Brittany has been with the practice for over 2 years. She came to our clinic from University Health-ExpressMed at Robert B Green Campus.

She grew up in the Rio Grande Valley. She earned a Division 1 athletic scholarship to UT Austin playing for the women’s golf team and graduated in 2007 with a Bachelor’s in Corporate Communications and Business Foundations. She went on to pursue a career in nursing, earning a 2nd Bachelors in Nursing, graduating in 2011 from Mississippi University for Women. After working a few years as a Registered Nurse, she attended Georgetown University in D.C. and graduated in 2016 with her Master’s in Nursing specializing in Family Practice.

When she’s not at the clinic, she’s a busy mom of 2 children and has one on the way. She’s married to her husband who is a pilot in the USAF. She loves to spend time with her family outdoors hiking, biking and exploring new areas of Texas. She loves to travel to the mountains any chance she gets.

Available Wednesday, Thursday, and Friday

Katherine Brunin, PA-C

Katherine started her path toward her career as a PA 15 years ago when she realized she had a love of medicine and helping people.

She grew up in Idaho and enjoyed spending lots of time outdoors, especially in the mountains. She decided to stay in her hometown while getting her undergraduate degree in biological sciences at Idaho State University. She then went on to attend PA school at Midwestern University in Glendale, Arizona and graduated with a Master’s degree in Physician’s Assistant Studies with an emphasis in healthcare education.

Available Mondays and Tuesdays

Our Staff

Mary Alonzo​


Linda Carreon​

Medical Assistant

Jessica Estrada​​

Medical Assistant

Monica Avalos​

Medical Assistant

Angela Hernandez​

Medical Assistant

Iris Sandoval​

Medical Assistant

Lisa Howard​​

Medical Assistant

Sabrina Flores

Medical Assistant

Jacob Bocanegra


Tomika Calloway​​

MA, Office Manager

Linda Chambliss​​

Practice Manager

China Calloway​​


Fellow of the American College of Physicians (ACP)

What do the letters FACP after Dr. Davis' name mean?

When you see the letters FACP after a physician’s name they mean that he or she is a Fellow of the American College of Physicians (ACP).

What is acp?

The American College of Physicians is the largest society of internists in the world.

What is an ACP Fellow?

Fellows in ACP are a special group of doctors who are dedicated to continuing education in medical practice, teaching, or research. Fellowship is an honorary designation given to recognize ongoing individual service and contributions to the practice of medicine.

Fellowship in ACP is a mark of distinction. It says that your doctor has made — and continues to make — special efforts to be a better doctor. Ultimately, it says your doctor cares about delivering good health care.

What does ACP Fellowship mean To YOU and what can it mean for YOU?

Fellowship in the ACP means that as a patient you can have confidence in your doctor. Through continual self-improvement and study, he or she adds to the knowledge and skills needed to deliver appropriate care for your medical needs, whether directly to you or with other specialists.

What does Fellowship tell you about your doctor?

  • Certified by the American Board of Internal Medicine, or another board acceptable to ACP. Certification requires having satisfactorily completed a minimum of 3 years of approved postgraduate training in internal medicine and passage of a rigorous 2-day examination. (This certification is sometimes waived because of other outstanding qualifications.)
  • Recognized by other internists for excellence and skill in medical practice, teaching, or research.
  • Pledged to keeping current with the latest advances in internal medicine.
  • Committed to professional activities and patient care.

How does a doctor become a Fellow in ACP?

Doctors must show that they are always growing and learning in order for the honor of Fellowship to be conferred. They may show this through activities such as teaching, hospital appointments, public service, community health planning, continuing medical education, publishing scientific articles, and advanced training.

They must also be recommended by other ACP Fellows who must attest to their character, ethics, and excellence in professional medical activities.

Physician Assistant

What is a Physician assistant?

Physician Assistants are health care professionals licensed to practice medicine with physician supervision. As part of their comprehensive responsibilities, PAs conduct physical exams, diagnose and treat illnesses, order and interpret tests, counsel on preventive health care, assist in surgery, and in virtually all states can write prescriptions. Within the physician-PA relationship, Physician Assistants exercise autonomy in medical decision making and provide a broad range of diagnostic and therapeutic services.

Because of the close working relationship the PAs have with physicians, PAs are educated in the medical model designed to complement physician training.

What does "PA-C" stand for? What does the "C" mean?

PA-C Stands for Physician Assistant-Certified. It means that the person who holds the title has met the defined course of study and has undergone testing by the National Commission on Certification of Physician Assistants (NCCPA).

What education and training does a PA have?

Physician Assistants receive a broad education in medicine. Their education is ongoing after graduation through continuing medical education requirements and continual interaction with physicians and other health care providers.

Physician Assistant educational programs usually take a minimum of 2 years to complete for full-time students. Most programs are at schools of allied health, academic health centers, medical schools, or 4-year colleges. Many accredited PA programs have clinical teaching affiliations with medical schools. Most applicants to PA educational programs already have a college degree and some health-related work experience as registered nurses, emergency medical technicians, and paramedics.

PAs are trained in intensive education programs accredited by the Accreditation Review Commission on Education for the Physician Assistant (ARC-PA) to provide diagnostic, therapeutic, and preventive healthcare services. To maintain their national certification, PAs must log 100 hours of continuing medical education every 2 years and sit for a recertification every 6 years. Graduation from an accredited Physician Assistant program and passage of the national certifying exam are required for state licensure.

Dr. Davis' clinic sign says "Lisa Davis MD, PA". Is she a PA also?

No. Dr. Davis a “Medical Doctor” (MD) specifically trained in Internal Medicine. The “PA” on her sign is simply a required legal designation that her clinic is a “Professional Association” (PA) form of Business Corporation, formed under the laws of the State of Texas.

Medical Assistant

What is a ma?

Medical Assistants (MA) perform administrative and clinical tasks to keep the offices of physicians and other health practitioners running smoothly. In most practices, Medical Assistants usually do many different kinds of tasks, handling both administrative and clinical duties and reporting directly to an office manager, physician, or other health practitioner. Some MAs specialize in a particular area, under the supervision of department administrators.

Administrative Medical Assistants update and file patients’ medical records, fill out insurance forms, and arrange for hospital admissions and laboratory services. They also perform tasks less specific to medical settings, such as answering telephones, greeting patients, handling correspondence, scheduling appointments, and handling billing and bookkeeping.

Clinical Medical Assistants have various duties, depending on State law. Some common tasks include taking medical histories and recording vital signs, explaining treatment procedures to patients, preparing patients for examinations, and assisting physicians during examinations. MAs collect and prepare laboratory specimens and sometimes perform basic laboratory tests, dispose of contaminated supplies, and sterilize medical instruments. As directed by a physician, they might instruct patients about medications and special diets, prepare and administer medications, authorize drug refills, telephone prescriptions to a pharmacy, draw blood, prepare patients for x rays, take electrocardiograms, remove sutures and change dressings.

What education and training does an MA have?

Postsecondary programs usually last either 1 year and result in a certificate or diploma, or 2 years and result in an associate degree. Courses cover anatomy, physiology, and medical terminology, as well as keyboarding, transcription, recordkeeping, accounting, and insurance processing. Students learn laboratory techniques, clinical and diagnostic procedures, pharmaceutical principles, the administration of medications, and first aid. They study office practices, patient relations, medical law, and ethics. There are two accrediting bodies that accredit medical assisting programs. Accredited programs often include an internship that provides practical experience in physicians’ offices or other healthcare facilities.

What is a Certified MA?

A Certified Medical Assistant meets certain standards of knowledge. There are various associations — such as the American Association of Medical Assistants (AAMA) and Association of Medical Technologists (AMT) — that award certification credentials to Medical Assistants. The certification process varies by association.

What is an FNP-C?

An FNP-C is a family nurse practitioner certified by the American Academy of Nurse Practitioners (AANP). The FNP-C certification covers clinical care and is a common choice for practitioners who want to work in a clinical setting.
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