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Meet Our DietMD  Team

Dr. J. Shaun Murphy

J. Shaun Murphy, MD

Medical Director

J. Shaun Murphy, MD, a native of Richardson, TX, attended Jesuit High School and was salutatorian of his graduating class. His medical training began at the University of Texas Health Science Center in San Antonio, and it ultimately found him completing his residency at Baylor University Medical Center in Dallas.

Dr. Murphy and his medical staff are very passionate about providing personalized medical care to each of his patients.

Sonyta So, PA-C

Sonyta So, PA-C

Physician Assistant

Sonyta So is a certified physician assistant with experience in family medicine and urgent care. She was born and raised in Garland, TX and graduated from Texas Woman’s University with her Bachelor’s degree in Biology along with minors in both English and Chemistry in 2005.

Sonyta then completed her training at Nova Southeastern University in Fort Lauderdale, FL in 2009 with a Master’s degree of Medical Science in Physician Assistant studies. She is certified through the National Commission on Certification of Physician Assistants and licensed through the Texas Medical Board.

Kevin McCulloch, RD

Kevin McCulloch, RD

Registered Dietitian

Kevin McCulloch, RD, is a Registered Dietitian at DietMD®. He completed his undergraduate degree and Dietetic Clinic Internship at Texas Tech University.  Kevin has over 1,000 hours of diabetes education experience that he combines with emerging research to construct individualized health plans to meet each patient’s needs. Kevin helps patients modify their dietary and lifestyle habits while providing accurate and applicable data to help control blood sugar and improve overall health and vitality.

Sarah Heringer, PA-C

Sarah Heringer, PA-C

Physician Assistant

Sarah Heringer is a certified physician assistant. With a positive approach to healthcare. Sarah was raised in the country in rural eastern Montana. Sarah completed a Bachelor of Science degree at Valley City State University in North Dakota.

Sarah earned honors as the Biology Student of the Year in 2006. She continued her education at Rocky Mountain College in Montana and achieved a Master’s Degree in Physician Assistant studies in 2009.

Victoria Signorelli, Nutritionist

Victoria Signorelli


Victoria Signorelli is a Nutritionist at DietMD® who provides effective weight loss, health, and nutrition guidance to patients. After obtaining a Bachelor of Health Science degree from Angelo State University, Victoria spent the last year as a dedicated nutritionist. She personally coached over 25 individuals, accumulating a 300lb weight-loss success within the first 6 months. Victoria is extremely dedicated and driven to help improve the quality of life for all her patients through nutrition education and heartfelt compassion.


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