Welcome, New Providers!

Now accepting new patients at these locations

Shannon Clinic Knickerbocker, 3555 Knickerbocker Road

Robert Alexander, MD—Orthopedics

Dr. Alexander received his bachelor's degree from Angelo State University and his medical degree from the University of Texas Medical Branch in Galveston. He completed his surgery research fellowship at the University of Texas Medical Branch Surgery Department in Galveston and his spine fellowship at Florida Orthopaedic Institute, Tampa General Hospital in Tampa. He completed his orthopedic residency at the University of Texas Medical Branch in Galveston.

For appointments or information, please call 325.747.8030.

Ross Alexander, MD—Dermatology

Dr. Alexander received his bachelor's degree from Angelo State University and his medical degree from the University of Texas Medical Branch in Galveston. He completed his general surgery residency at the University of Texas Health Science Center in San Antonio. He is a member of the American Academy of Dermatology.

For appointments or information, please call 325.747.8035.

William L. Burkes, MD— Ophthalmology

Dr. Burkes received his bachelor's degree from Texas A&M University in College Station and his medical degree from Texas A&M Health Science Center in College Station. He completed his ophthalmology residency at Texas Tech University Health Sciences Center in Lubbock. He's a member of the American Ophthalmology Association and the Texas Ophthalmology Association.

For appointments or information, please call 325.747.8020.

Penni Cambre, MD—Pediatrics

Dr. Cambre received her bachelor's degree from Lamar University in Beaumont, Texas, and her medical degree from the University of Texas Health Science Center in San Antonio. She completed her residency at the University of Texas Medical Branch Department of Pediatrics in Galveston.

For appointments or information, please call 325.747.8040.

Warren Conway, MD—Family Practice

Dr. Conway received his bachelor's degree from Texas A&M University in College Station and his medical degree from Texas A&M Health Science Center in College Station. He completed his family medicine residency at Texas Tech University Health Sciences Center in Odessa.

For appointments or information, please call 325.747.8045.

Ted Hackl, MD—Ophthalmology

Dr. Hackl received his bachelor's degree from Rochester Institute of Technology in New York and his medical degree from Texas Tech University School of Medicine in Lubbock. He completed his ophthalmology residency at Texas Tech University School of Medicine.

For appointments or information, please call 325.747.8055.

Deborah Hajovsky, MD—OB-GYN

Dr. Hajovsky received her bachelor's degree from Texas A&M University in College Station, Texas, and her medical degree from the University of Texas Medical Branch in Galveston. She completed her residency at the University of Texas Medical Branch Department of Obstetrics and Gynecology. She is board certified by the American Board of Obstetrics and Gynecology.

For appointments or information, please call 325.747.8065.

Sara Halfmann, MD—Pediatrics

Dr. Halfmann received her bachelor's degree from Angelo State University in San Angelo and her medical degree from Texas Tech University School of Medicine in Lubbock. She completed her pediatric residency at Texas Tech University Health Sciences Center in Lubbock. She is a member of the American Academy of Pediatrics and the Texas Pediatric Society.

For appointments or information, please call 325.747.8060.

Darrell Herrington, DO—Family Practice

Dr. Herrington received his medical degree from the Texas College of Osteopathic Medicine in Fort Worth. He completed his chief internship at the Dallas/Fort Worth Medical Center in Grand Prairie, Texas. He is certified by the American Osteopathic Board of Family Physicians, as well as the American Board of Hospice and Palliative Medicine.

For appointments or information, please call 325.747.8075.

Joe Wilkinson, MD—Orthopedics

Dr. Wilkinson received his bachelor's degree from Lamar University in Beaumont, Texas, and his medical degree from the University of Texas Medical Branch in Galveston. He completed his residency at the University of Texas Health Science Center in San Antonio. He is certified by the American Board of Orthopaedic Surgery and is a fellow of the American Academy of Orthopaedic Surgeons, the American College of Surgeons and the Arthroscopy Association of North America.

For appointments or information, please call 325.747.8095.

Joy Gibbs, ANCC, FNP-BC—Family Practice

Joy received her bachelor's degree from Texas Women's University in Denton and her master's degree from the University of Texas at Arlington. She has over 23 years of medical experience in a variety of clinical settings.

For appointments or information, please call 325.747.8050.

Jennifer Marburger, CPNP-AC—Pediatrics

Jennifer received her bachelor's degree and two master's degrees from the University of Texas at Arlington. She has over 13 years of medical experience in pediatric and acute patient care.

For appointments or information, please call 325.747.8080.

Mickey Matthews, PA-C, MPAS, M.Ed—Orthopedics

Mickey received his bachelor's and master's degrees from Angelo State University. He also completed a second master's degree at the University of Texas Medical Branch in Galveston. He has over eight years of medical experience in orthopedic surgical care.

For appointments or information, please call 325.747.8085.

Jennifer Slaven, RN, MSN, CNS—OB-GYN

Jennifer received her bachelor's and master's degrees from Angelo State University. She has over 13 years of medical experience in obstetric and gynecological patient care.

For appointments or information, please call 325.747.8090.

Shannon South—Williams Family Center, 3501 Knickerbocker Road

Charles Harzke, MD—OB-GYN

Dr. Harzke received his bachelor's degree from Texas A&M University in College Station and his medical degree from Texas Tech University Health Sciences Center in Lubbock. He completed his residency at Texas Tech University Health Sciences Center Department of Obstetrics and Gynecology in El Paso. He is certified by the American Board of Obstetrics and Gynecology.

For appointments or information, please call 325.747.8070.

Shannon Clinic Harris, 220 E. Harris

Megan Blanek, WHCNP—OB-GYN

Megan received her undergraduate degree from Texas Tech Health Sciences Center in Lubbock and her master's degree from the University of Cincinnati in Cincinnati, Ohio. She is board-certified as a women's health care nurse practitioner. She has more than 16 years of experience in women's health care. Megan joins the practice of Laura Adams, MD, and Jenny Wiggins-Smith, DO.

For appointments or information, please call 325.481.2285.

Shannon Clinic West, 4450 Sunset Drive

Donald Cook, Au.D., FAAA—Audiology

Donald received his bachelor's degree from Texas Tech University in Lubbock and his master's degree from the University of North Texas in Denton. He completed his audiology clinical doctorate degree at the University of Florida in Gainesville. He is board-certified by the American Academy of Audiology and the Texas Academy of Audiology.

For appointments or information, please call 325.481.2283.

Shannon Clinic Magdalen, 102 N. Magdalen

Sarah Sewell, MSN, APRN, FNP-C—Oncology

Sarah received her undergraduate and master's degrees in nursing from Chamberlain University in Downers Grove, Illinois. She has over 10 years of experience providing patient care in a variety of clinical settings. Sarah joins the practice of Raj Cheruku, MD.

For appointments or information, please call 325.481.2025.

Garrett Sheppard, PA-C—Neurosurgery

Garrett received his bachelor's degree from Angelo State University. He earned his master's degree in physician assistant studies at Hardin-Simmons University in Abilene, Texas. He is a member of both the American Academy of Physician Assistants and the Texas Academy of Physician Assistants. Garrett joins the practice of Luis Duarte, MD.

For appointments or information, please call 325.481.2193.

Need a Provider?

You can search Shannon's online directory by distance from your home. Try it at shannonhealth.com/provider-directory.

Find a Provider