Staff

Our staff has over 50 years of combined medical experience specializing in treating acute disease, chronic disease, and preventive health and wellness.

 

Michael Maloy MD : Physician

Michael Maloy MD

Physician

Born and raised in Yoakum, TX, Michael Maloy, Jr, MD studied biology at the University of Texas at San Antonio before receiving his medical degree from the University of Texas School of Medicine at San Antonio. He completed his residency in internal medicine at the University of Texas Health Science Center-RAHC in Harlingen, TX. While in South Texas, Dr. Maloy served as an Assistant Professor of Medicine, teaching medical students and developing inpatient curriculum. He established Sigma Physician Associates in 2016 with a mission to bridge the gap between inpatient and outpatient settings by providing higher quality of care individualized to each patient. In addition to medicine, Dr. Maloy has other passions; in his free time he enjoys spending time with family, hiking, and lifting weights.

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Maria Najera MD : Internal Medicine - Board Certified

Maria Najera MD

Internal Medicine - Board Certified

Dr. Maria Najera comes from the Rio Grande Valley and attended medical school at Universidad de Monterrey in Monterrey, Mexico. During her medical training, she performed an undergraduate internship at Methodist Healthcare System in San Antonio in 2006 and completed her medical degree in 2008. She returned home to the Valley for her residency in internal medicine at the University of Texas Health Science Center- RAHC program at Valley Baptist Hospital in Harlingen, graduating in 2015. She came back to San Antonio with her husband and daughters. In her free time she enjoys spending time with her family, going to the movies and traveling. She looks forward to providing quality medical care to the community.

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Katrina Villa NP : Nurse Provider

Katrina Villa NP

Nurse Provider

Katrina Villa was born and raised in Port Lavaca, Texas. She began her career in healthcare as a Licensed Vocational nurse while obtaining her nursing degree from University of Texas at Arlington in 2012. She then worked as a Registered nurse in San Antonio in the post-acute setting caring for patients in med-surg, orthopedic and neuro-rehabilitation. She completed graduate school at Chamberlain College of Nursing, earning her Master of Science in Nursing in 2018. She holds a national board certification by the American Academy of Nurse Practitioners as a Family Nurse Practitioner. She enjoys caring for patients in both inpatient and outpatient settings.  In her spare time, she likes to read books, work out and spend time with her family.

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Kathryn Makarevich NP : Nurse Practitioner

Kathryn Makarevich NP

Nurse Practitioner

Kathryn Makarevich is a Board Certified Family Nurse Practitioner. Kathryn is from California where she completed her Bachelor’s degree in Nursing. She continued her education and graduated magna cum laude from Walden University earning a Master’s degree with a specialization in FNP in 2015. Kathryn’s clinical interests include acute care, geriatrics, and preventative care. In her spare time Kathryn enjoys spending time with her family and friends, watching movies, and exploring San Antonio.

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