Meet The Team

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Experts in Nutrition.
Partners in Your Wellness.

Founded by Jan Tilley, MS, RDN, LD, and led by Chelsea Marquez, MS, 
RDN, LD. Our team of expert Registered Dietitians brings decades of 
experience to the table – literally. From pediatric dietitian services to adult diabetes nutrition support, we help individuals and families 
build healthier lives using food as medicine.

MEET OUR TEAM

Committed to Your Health and Wellness

At JTA Wellness, OUR STRENGTH LIES IN OUR PEOPLE. From experienced dietitians to compassionate care coordinators and creative marketers, every team member is dedicated to one goal: helping you thrive through personalized, evidence-based nutrition care.

Jan Tilley, MS, RDN, LD Image

Jan Tilley, MS, RDN, LD

Founder (Retired)

Jan Tilley, MS, RDN, LD

Founder (Retired)

Jan Tilley, Founder of JTA Wellness, is a national leader in nutrition counseling, wellness and chronic disease management. Jan is currently retired.
Chelsea Marquez MS, RDN, LD Image

Chelsea Marquez MS, RDN, LD

CEO and Owner

Chelsea Marquez MS, RDN, LD

CEO and Owner

Chelsea is a Registered Dietitian with a bachelor’s and master’s degree in nutrition from Texas Woman’s University.
Rene Marquez MS, RDN, LD Image

Rene Marquez MS, RDN, LD

CFO and Owner

Rene Marquez MS, RDN, LD

CFO and Owner

I’m a healthcare leader turned wellness enthusiast with a deep love for nutrition and cultural heritage.
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Mary Jane Medlin

Practice Manager

Mary Jane Medlin

Practice Manager

Mary Jane graduated from Texas A&M University-Kingsville with a degree in Business Administration and has worked in the financial sector for over 30 years.
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Nicki L. Ortiz, CHES, CWWS

Director of Workplace Wellness

Nicki L. Ortiz, CHES, CWWS

Director of Workplace Wellness

Nicki came to JTA Wellness as an intern in the summer of 2013 and has since developed our workplace wellness programming into the dynamic department we have today.
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Sarah Hunsicker-Allen

Director of Patient Relations

Sarah Hunsicker-Allen

Director of Patient Relations

In 2018, Sarah transitioned to JTA Wellness, eager to combine her passion for health and wellness with her strong background in business management.
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Cristine Saks, MS, RDN, LD

Clinical Nutrition Manager

Cristine Saks, MS, RDN, LD

Clinical Nutrition Manager

Cristine Saks graduated from St. Mary’s University with a Bachelor of Science in Biology and a minor in Chemistry. She completed her dietetic internship and earned a Master’s degree in Nutrition from the University of the Incarnate Word.
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Jerrica Garza, RDN, LD

Registered Dietitian Nutritionist

Jerrica Garza, RDN, LD

Registered Dietitian Nutritionist

Jerrica graduated from The University of Texas at Austin with a Bachelor of Science in Nutrition and Dietetics and completed her Dietetic Internship through the Coordinated Program in Dietetics at UT Austin.
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Nour Amin, MS, RDN, LD

Registered Dietitian Nutritionist

Nour Amin, MS, RDN, LD

Registered Dietitian Nutritionist

Nour is an accomplished nutrition professional with a Bachelor of Science in Nutrition and Dietetics and a Masters in Dietetic Studies. With a diverse internship experience in community, food service, and clinical settings.
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Nicole Harris, MS, RDN, LD, IFNCP

Registered Dietitian Nutritionist

Nicole Harris, MS, RDN, LD, IFNCP

Registered Dietitian Nutritionist

Nicole is a dedicated advocate for empowering her clients to take control of their health. Through patient-centered counseling, she supports clients in becoming well-informed and proactive participants in their healthcare journey.
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Kelsie Raign, MS, RDN, LD

Registered Dietitian Nutritionist

Kelsie Raign, MS, RDN, LD

Registered Dietitian Nutritionist

Kelsie is a registered dietitian, licensed in Texas, with a bachelor’s and master’s degree in human nutrition from Texas State University. She spent 3 years studying the link between obesity, inflammation, and cancer and enjoys educating people on nutrition and diseases.
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Rachel Bland, RDN, LD

Registered Dietitian Nutritionist

Rachel Bland, RDN, LD

Registered Dietitian Nutritionist

Rachel completed her Bachelor of Science degree in Nutrition & Foods as well as her Dietetic Internship at Texas State University. Her Internship and Master-level courses had a focus in pediatric nutrition.
James (J.R.) Oliver, MS, RDN, LD, CWWS Image

James (J.R.) Oliver, MS, RDN, LD, CWWS

Registered Dietitian Nutritionist

James (J.R.) Oliver, MS, RDN, LD, CWWS

Registered Dietitian Nutritionist

J.R. is a Registered Dietitian who graduated from Texas State University with a Bachelor and Master of Science degree in Human Nutrition. He is passionate about helping people achieve a high quality of life at any age and believes that education plays a central role.
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Amanda Christiansen, MS, RDN, LD

Registered Dietitian Nutritionist

Amanda Christiansen, MS, RDN, LD

Registered Dietitian Nutritionist

Amanda Christiansen graduated from Texas State University with a Bachelor of Science in Nutrition and Foods and a Master of Science in Human Nutrition.
Kat Garcia-Benson, RDN, CSSD, LD, CPT, NBC-HWC Image

Kat Garcia-Benson, RDN, CSSD, LD, CPT, NBC-HWC

Registered Dietitian Nutritionist

Kat Garcia-Benson, RDN, CSSD, LD, CPT, NBC-HWC

Registered Dietitian Nutritionist

Kat is a Registered Dietitian Nutritionist and Board Certified Specialist in Sports Nutrition with a decade of experience helping individuals fuel performance and build a healthier relationship with food.
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Alexandra Hajek, MS, RDN, LD

Registered Dietitian Nutritionist

Alexandra Hajek, MS, RDN, LD

Registered Dietitian Nutritionist

Alexandra (Alex) is a Registered Dietitian with a bachelor’s and master’s degree in Nutrition from Texas State University. She has experience working with individuals across the lifespan, from newborns to those in their 90s.
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Rhiannon Lopez

Referral Coordinator

Rhiannon Lopez

Referral Coordinator

Rhiannon graduated from UTSA with a Bachelor’s in Kinesiology – Exercise Physiology. She has always had a passion for helping others learn and grow; mentally, emotionally, and physically.
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Chloe Redd

Patient Coordinator

Chloe Redd

Patient Coordinator

Chloe has worked closely with the community for over 10 years and takes pride to be transitioning her career in healthcare with an established healthcare practice like JTA Wellness.
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Delmy Julian

Patient and Marketing Coordinator

Delmy Julian

Patient and Marketing Coordinator

Delmy is a current student at The University of Texas A&M majoring in Business Administration & Marketing. Her most recent positions have been at Altiqe Consulting and Ratner Consulting.
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Clarissa Samaniego

Patient Care Scheduling Coordinator

Clarissa Samaniego

Patient Care Scheduling Coordinator

Clarissa brings over nine years of patient care experience and a deep passion for health and wellness. Originally from Frisco, Texas, she joined the JTA Wellness family in April of 2025.
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Katrina Putman

Admin Assistant

Katrina Putman

Admin Assistant

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Hear From Our Clients

Don’t just take our word for it – see how JTA Wellness has changed lives. Our clients share their journeys of transformation, health, and hope.

Read Our Testimonials

Let’s Take the Next Step Together

Whether you’re seeking support with chronic illness, improving your family’s nutrition, or launching a workplace wellness initiative, our expert team is here for you.

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