Shannon Marek, M.D.



1305 Wonder World Dr Ste 200

San Marcos, TX 78666

Open today 8 AM - 5 PM

Quick Facts

  • Virtual Telemedicine Visits Available, Call For Details
  • Board Certified Gastroenterologist
  • Currently Accepting New Patients
  • Most Insurance Plans Accepted
  • Performs Colonoscopies

TDDC - San Marcos Research

Gastroenterology in San Marcos, TX

TDDC - San Marcos Research

1305 Wonder World Dr

Ste 200

San Marcos, TX 78666

Open today 8 AM - 5 PM


Texas Digestive Disease Consultants - San Marcos, TX

Gastroenterology in San Marcos, TX

Texas Digestive Disease Consultants - San Marcos, TX

1305 Wonder World Dr

Ste 200

San Marcos, TX 78666

Open today 8 AM - 5 PM

Request an Appointment

If you are experiencing a medical emergency, please call 9-1-1. This form is intended for non-urgent appointment requests only. Non-emergency requests will be responded to within 24-48 hours.

About Shannon J. Marek, M.D.

Why did you choose to specialize in Gastroenterology?

Growing up working in my family’s automotive business outside of Dallas and on the farms of my extended family, I learned early on the importance of work ethic and the joys of working with my hands. Whether it was dissembling my Tonka trucks or studying astronomy, the challenge of discovering “why” things work has also been another passion. For as long as I can remember, being a physician has been the goal and culmination of these two passions. Particularly the field of GI. Not only do I get the opportunity to study some of the most intriguing and poorly understood organs in the human body, I also get to work with my hands doing complex and intricate procedures. As a physician with humble beginnings and a loving family to keep me grounded, I strive to translate the
complex medical world of the gut and liver into an
understandable experience for my patients.

Do you have a specialty of interest within GI?

I have the blessing of having a job that I actually wake up every day and look forward to going to! I enjoy the every aspect of my field, but have a particular affinity for a few areas. I enjoy the intellectual challenges presented by Inflammatory Bowel Disease and its evolving treatments. Crohn’s and Ulcerative Colitis remain largely under researched and are areas of great opportunity for us to improve the field of medicine and most importantly, the quality of life for our patients. On the procedural side, I enjoy the evolving and cutting edge technology being used today. Being trained in numerous aspects of advanced endoscopy including stent placement, endoscopic mucosal resection, wireless capsule endoscopy and even the latest method of nonsurgical hemorrhoid treatment, I am always interested in where technology and improved techniques can take us.

Where did you study?

As a first generation college student, I attended Baylor University on Presidential scholarship and graduated cum laude. While there, I was involved with the advanced coursework of the Interdisciplinary Core, Honors program, and served with the Baylor Chamber of Commerce helping to plan and execute some of the largest collegiate celebrations in the nation as well as caring for Baylor’s live bear mascots. I received my Bachelors of Arts degree in Psychology. I then went on to receive my Doctorate of Medicine from the University of Texas at Houston Medical School. Following this, I completed my internship and residency at the University of Alabama at Birmingham, one of the top 10 internal medicine programs in the nation at the time. Afterward, I completed fellowship at the Medical College of Georgia before returning home to Texas to practice.

What certifications do you hold?

Board Certified in Internal Medicine and Gastroenterology.

Do you have any special honors or recognition in your medical career that you would like to share?

I have been named as one of Texas Monthly’s Super Doctors Rising Stars, a peer selected award given to fewer than 2.5% Texas physicians. During residency, I was awarded as one of UAB’s most outstanding residents. I have presented at multiple national conferences, published research articles, and helped to author a preeminent textbook in the field of GI.

Please list your professional affiliations.

I am president of the Comal Medical Society, as well as a member of American Gastroenterological Association, American Society for Gastrointestinal Endoscopy, and Texas Society for Gastroenterology & Endoscopy. I also serve on the New Braunfels Christian Academy School Board and am part of the Medical Executive Committee of our local hospital. I am a member of the New Braunfels Chamber of Commerce and an alumnus of Leadership New Braunfels.


My what a good listener Dr Marek is! He easy to talk to and was so helpful in his responses. I was call in on time. I highly recommend him!

B.M. Google

I was not an actual patient here, but had an encounter over the phone with a staff member. I was looking for a Gastro doctor for my seven year old son. The woman who answered the phone was named Whitney. She advised me that they do not see pediatric patients, but she said for me to hold on and she would get me information on doctors who treat pediatric patients. She went as far as researching several doctors and providing their numbers as well as their ratings on Google. During our phone encounter, she was so patient and never made me feel like I was inconveniencing her. For her to take the time to assist me with this truly means a lot. She truly did not have to go above and beyond but she did and I appreciate her for this! Her customer service skills are impeccable and I truly hope her supervisor sees this review because she deserves recognition. Whitney, if you see this review, thank you again for all of your help today.

L.S. Google

Smooth getting in. Nice staff,efficient.

M.F. Google

Dr. Marek actually listened to what I had to say, instead of dismissing me like previous specialists did in the past. He is willing to work with my gynecologist to figure out what’s wrong with me. Thanks!

J.E. Google

Good report with the dr.

P.&. Google


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