Meet The Team

Jan Tilley is the founder and president of JTA Wellness. With a master’s degree in Nutrition and over two decades in the food and nutrition industry, Jan launched JTA Wellness to offer science-based, practical solutions for chronic health issues.

Chelsea Marquez is the President and CEO of JTA Wellness. With both a Bachelor’s and Master’s degree in Nutrition from Texas Woman’s University, Chelsea brings over a decade of experience in clinical and community nutrition.

Cristine is a registered dietitian with expertise in weight management, pediatric nutrition, pregnancy and postpartum health, food allergies, and corporate wellness. She holds advanced certifications in Food Allergies and Health & Wellness Coaching.

Jerrica is a passionate dietitian who earned her degree through the Coordinated Program in Dietetics at The University of Texas at Austin. With hands-on experience at organizations like H-E-B, Feeding Texas, and Texas Athletics, she brings a strong foundation in exercise nutrition, women’s health, and counseling.

Nour is a dedicated nutrition professional with a BS in Nutrition and Dietetics and a minor in Psychology from UTSA, complemented by a Master’s in Dietetic Studies. Her diverse internships span clinical, community, and foodservice settings, including Methodist Hospital and the Eating Recovery Center.

Nicole is passionate about empowering clients to take charge of their health through a holistic, patient-centered approach. With a BS in Biochemistry, an MS in Nutrition, and 5 years of research experience at top.

Kelsie is a registered dietitian with a bachelor’s and master’s degree in human nutrition from Texas State University. She has a strong background in studying the link between obesity, inflammation, and cancer, and is passionate about educating others on disease prevention and management.

Rachel is a registered dietitian with a Bachelor of Science in Nutrition & Foods from Texas State University, where she also completed her Dietetic Internship with a focus in pediatric nutrition. She has experience working with families, children, and underserved communities through programs like Pre-K 4 SA and the San Antonio Food Bank.

J.R. is a registered dietitian with bachelor’s and master’s degrees in Human Nutrition from Texas State University. He specializes in weight management, body composition, plant-based nutrition, and chronic conditions like PCOS, diabetes, fatty liver, and hypertension.

Amanda holds both a Bachelor of Science in Nutrition and Foods and a Master of Science in Human Nutrition from Texas State University. She completed her dietetic internship through Be Well Solutions with a focus on wellness-based care.

Kat is a registered dietitian nutritionist, board-certified specialist in sports dietetics, and national board-certified health and wellness coach with over 10 years of experience. She specializes in sports nutrition, digestive health, PCOS, and prenatal care, using an evidence-based, weight-neutral approach.

Mary Jane Medlin is the Practice Manager at JTA Wellness, bringing over 30 years of experience in the financial sector. She holds a Business Administration degree from Texas A&M University-Kingsville and oversees the daily operations of the practice, ensuring smooth workflows and quality patient care.