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Our Story

Dr. Carlo M. Taboada founded his research institute, Clinical Associates in Research Therapeutics of America (CARTA for short), in January of 2016. He has well over 20 years of research experience as he was previously Chief Operations Officer of a national gastrointestinal research company for 15 years where he oversaw the daily operations of over 15 research sites around the country. Our home office is located in San Antonio, Texas. Dr. Carlo M. Taboada is active in clinical research primarily in the area of gastrointestinal illnesses, particularly, inflammatory bowel disease. He has spent the last 22 years of his career devoted to improving the quality of life of patients suffering from this chronic, debilitating disease, thru clinical research trials, which are readily available for physicians and their patients at his research institute.

CARTA RESEARCH is devoted solely to helping improve the lives of patients through the auspices of clinical research trials that are made available in partnership with clinicians who are looking for an alternative to treating diseases that have been refractory to conventional therapies. One of the great things about clinical research is that they are fully funded so it is of no cost whatsoever for patients, which means underinsured or non-insured patients need not worry as everything is paid for! This truly helps clinicians concentrate on their patients' disease states and help them get back on track through clinical research trials. This is what our mantra at CARTA embodies: "Lending a Hand in your Path to Recovery!" 

Meet The Team

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Carlo M. Taboada, MD

Dr. Taboada is the Chief Executive Officer at Clinical Associates in Research Therapeutics of America, CARTA. 


His involvement in clinical trials includes both academic and pharmaceutical research.


He has successfully developed and evolved over 17 clinical research centers throughout the country. 


Dr. Taboada understands the trials and tribulations for medical practices; through clinical research, he is able to partner up with specialists and bring clinical trials to them and their patients. Through this symbiotic relationship, he is able to help patients by providing their physicians with the appropriate trials to help them improve their quality of life by controlling their disease states. Just one more tool in the armamentarium to help clinicians and patients achieve their goals for a better life through better disease control. 


Jaime L. Mayoral, MD

Dr. Mayoral is the President of San Antonio Colon and Rectal Clinic where he has been in private practice since 1995. 


Dr. Jaime L. Mayoral and his group specialize in diseases of the colon and rectum and abdominal surgery primarily through laparoscopic techniques. They are also well versed in robotics surgery (DaVinci Surgery) as well as Sacral Neuromodulation (Interstim). 


Dr. Mayoral is the Program Director of the Colorectal Surgery Fellowship at Methodist Hospital. He also is the Director of the US Army Trauma Simulation Laboratory, at the Mayo Clinic in Rochester, Minnesota. 


He most recently retired as a Colonel from the United States Army after faithfully serving our great nation for 28 years.


Linda Ingeborg Esquivel, MD

Dr. Esquivel was born in Laredo, Texas. She attended St. Mary's University in San Antonio, where she graduated Summa Cum Laude. She received her medical degree from the University of Texas School of Medicine at San Antonio and went on to complete her residency in Family Medicine at CHRISTUS Santa Rosa, where she graduated with honors. 

Dr. Esquivel has been awarded "Most Compassionate Doctor" from 2009 to 2014. She is also a 5 year honoree of the "Patients Choice Award" as well as voted as one of "San Antonio's Top 10 doctors" in 2014.


Regina K. Lee, MD

Dr. Lee was born in Bonham, TX. She attended Texas Tech University for her undergraduate studies and obtained her medical degree from the University of Texas School of Medicine at San Antonio. She completed her residency in Family Medicine at Christus Santa Rosa.


Kathy Untermeyer, CCRC & MA

We have been beyond blessed to count on Kathy as our lead research coordinator for CARTA. Her devotion to research for the last 12 years as a Certified Clinical Research Coordinator speak volumes of her love for this profession!!

*Dr. Taboada obtained his medical degree from the University of Monterrey in Monterrey, Mexico. He is a not licensed to practice medicine in the State of Texas.


Sadie Perez, CRA

Sadie joins the research team as a clinical research associate. She is currently in her senior year at the University of Texas at San Antonio pursuing a Biology degree. She has a strong desire to help people & is eager to learn the world of clinical research and how it contributes to helping people coping with chronic diseases. We are very blessed to count on her passion to serve others - one of CARTA's mantras!!

Our associates

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San Antonio Colon and Rectal Clinic


Family Health of South Texas

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