Health Pros Promotional Features

Gastroenterology Associates: Meet the doctors

Written by Healthy Living

Dr. Mariana de Jongh and Dr. Thomas Mathew are proud to work for Gastroenterology Associates.


Dr. Mariana de Jongh

Since opening its doors 35 years ago, Gastroenterology Associates has maintained a reputation for honesty, integrity and accountability. Those core values are why Dr. Mariana de Jongh joined the practice eight years ago and happily remains there today.

“It’s great to be part of a well-oiled machine where the team of doctors support and help one another,” she says. “We’ve perfected the art of giving patients the best care in the gastrointestinal realm. It’s all about treating them with respect, empathy and expertise.”

She completed her residency at the Einstein Medical Center in Philadelphia and her fellowship at Tufts University in Massachusetts. For her, each day is an opportunity to sharpen her skills by performing procedures such as endoscopy, colonoscopy and Interstim, which treats urinary incontinence.

“It makes me happy to treat all sorts of gastrointestinal issues and improve a patient’s quality of life,” she says. “I also make sure people can talk to me about sensitive issues.”

Away from the job, she can be found spending many of her weekends at one of the Walt Disney World parks with her husband and three girls.

“I love being immersed in the magic of Disney,” she says.

Dr. Thomas Mathew

Dr. Thomas Mathew is in the business of saving lives. One of his specialties is screening for colorectal cancer, the third-most common cancer in both men and women, according to the National Cancer Institute. He feels screening should become an important component of everyone’s routine health care once they reach age 45. Oftentimes, these screenings detect precancerous polyps.

“We can remove them before they become cancerous and metastasize,” he says. “Screening is preventative maintenance—just like we do with our car or air conditioner. I’ve found cancer at all stages, but when I find it early, I know I can help patients experience good outcomes.”

Dr. Mathew completed his residency at the University of Illinois at Chicago and completed his fellowship at Scripps Clinic in San Diego. He has an obsession with sharks and enjoyed a cage dive in South Africa, where he saw a great white shark in the wild.

“They’re so beautiful in their natural environment,” he says. “These animals can eat almost anything, including metal and rubber. They are digestive machines, and since I work on the digestive system, I guess that’s why I admire them so much.”


Gastroenterology Associates // 1400 US Hwy 441, Suite 531, Lady Lake // 352.751.4885 // gaocala.com

About the author

Healthy Living

Healthy Living is unique in a sea of health magazines that only present information on nutrition and exercise. Published by Akers Media Group, Healthy Living goes much farther by focusing on the four pillars of a true wellness — physical, mental, spiritual and financial health.

Healthy Living promotes a healthy, well-balanced lifestyle with easy-to-read features, try-it-at-home exercise programs, and expert advice from financial planners, mental health professionals, and a variety of other leaders in their respective fields.

Leave a Comment