Jan Tilley, MS, RDN, LD
Founder
Jan Tilley, Founder of JTA Wellness, is a national leader in nutrition counseling, wellness and chronic disease management. Jan is currently retired.
Read more about Jan HERE.
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. She worked for over 10 years in the nutrition field and is passionate about changing the lives of people through optimization of nutrition. She specializes in Medical Nutrition Therapy of pediatric and adult nutrition in all major and advanced disease states, including eating disorders. Her goal is to help her patients transform their relationship with food.
Learn more about Chelsea HERE.
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. Cristine specializes in weight management, food allergies, pregnancy and postpartum nutrition, and pediatrics. She is proud to be able to counsel in both English and Spanish.
Learn more about Cristine HERE.
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. Jerrica has worked with numerous organizations ranging from sports nutrition, outpatient nutrition counseling, and nutrition program planning. She has a passion for community nutrition, exercise nutrition, and mental, emotional, and physical health. Believing nutrition is multifactorial and influenced by both internal and external conditions, Jerrica aspires to instill change within the San Antonio community by acknowledging, educating, and nourishing all dimensions of health.
Learn more about Jerrica HERE.
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, she is committed to helping individuals achieve optimal health through the power of nutrition. Nour specializes in weight management, eating disorders, and common chronic illnesses such as heart disease and diabetes. Her passion lies in guiding others towards a balanced lifestyle by combining evidence-based nutrition care and empowering sustainable dietary choices. Through her expertise and dedication, Nour promotes positive transformation and well-being.
Learn more about Nour HERE.
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. Her holistic approach during counseling sessions not only focuses on nutrition education but also considers the interconnectedness of the mind and body in making lasting changes. With a background in biochemistry and nutrition, as well as scientific research experience, Nicole excels in conveying the science behind lifestyle changes in order to help promote long-term adherence. Trained in integrative and functional whole foods nutrition, she specializes in providing functional nutrition therapy for various chronic conditions, helping clients transition from mere survival to thriving.
Learn more about Nicole HERE.
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. She is passionate about helping people improve their lifestyle habits to manage their health. She specializes in medical nutrition therapy for cancer, diseases of the liver and kidney, GI disorders, diabetes, tube feeds, and weight management. She believes nutrition and wellness is a transformative process that is essential for life.
Learn more about Kelsie HERE.
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. Rachel specializes in counseling an array of patients, including pediatric patients and families, as well as those struggling with Weight Management, Diabetes, Gastrointestinal Disorders and more.
Learn more about Rachel HERE.
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. He specializes in nutrition education for weight management, body composition (body fat loss/muscle gain), vegan/vegetarian nutrition, and chronic conditions including PCOS, pre- and Type 2 diabetes, fatty liver, high cholesterol, hypertension, and more. J.R. is a Certified Workplace Wellness Specialist and works with employee populations to enhance wellness culture and outcomes.
Learn more about J.R. HERE.
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. She completed her dietetic internship through Be Well Solutions, a wellness focused program. Amanda has experience with eating disorders, diabetes, weight management, and other chronic illnesses. As a goal-oriented nutrition professional, Amanda is dedicated to offering high-quality nutrition care that is tailored to each individual from all walks of life.
Learn more about Amanda HERE.
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. She is also a National Board Certified Health and Wellness Coach, and a certified Monash FODMAP-trained dietitian. Kat specializes in sports nutrition, digestive health, PCOS, and prenatal care, using an evidence-based, weight-neutral approach to guide clients toward sustainable habits. Through her work, she aims to empower people to break free from the dieting cycle and build a way of eating that fits their lifestyle and values.
Learn more about Kat HERE.
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, and understands the unique nutritional needs that come with each life stage. Alex specializes in Medical Nutrition Therapy for a wide range of conditions in both pediatric and adult populations and is passionate about empowering individuals and families to take charge of their health through evidence-based nutrition therapy.
Learn more about Alex HERE.
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. She is a proud Texan, who has been married to her loving husband for 30+ years with a beautifully blended family of 4 children, and 10 grandchildren. As the Practice Manager she manages all daily business aspects of the office and puts into place adequate management procedures to improve patient care. Since working at JTA Wellness, Mary Jane also has a new found desire for cooking. Being a breast cancer survivor for over 20 years, she has a dedicated passion for healthy living and strives to ensure each client here at JTA embraces that same goal.
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. Whether she’s assisting our partnered companies with their workplace wellness endeavors or directing our team, Nicki takes pride in her attention to detail and thorough execution. She graduated from The University of Texas at San Antonio with a degree in Community Health and has been certified as a Health Education Specialist and a Workplace Wellness Specialist. Nicki is passionate about nutrition and wellness and has plans to further her education with a graduate degree in public health. In her spare time, Nicki enjoys developing recipes, exploring San Antonio’s culinary scene, and group fitness classes.
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. After earning a Bachelor's degree in Accounting & Finance from the University of San Antonio in 2017, Sarah brought her analytical skills and attention to detail to the world of wellness.
With a warm smile and a proactive approach, Sarah plays a pivotal role in driving the success of JTA Wellness. As the Manager of Administrative Operations, she oversees a team of administrative representatives, ensuring smooth scheduling for practitioners and the seamless coordination of office responsibilities. She also manages the patient coordinators, who play a vital role in new patient onboarding, ensuring a smooth transition into care. Sarah’s contributions extend beyond daily operations; she is instrumental in developing and refining onboarding processes for new patients, corporate clients, and staff, including new dietitians.
In addition to her administrative responsibilities, Sarah assists with the company’s billing processes, ensuring accuracy and efficiency. As the Director of Marketing, she collaborates closely with the marketing coordinator to set strategic goals and drive growth initiatives, guiding the company toward its long-term marketing objectives.
Outside of her professional life, Sarah is dedicated to maintaining a healthy and active lifestyle. She enjoys spending quality time with her husband and son in the beautiful Texas Hill Country, and as an advocate for wellness, she participates in CrossFit and enjoys walking her dog, Oakley, whenever possible.
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. Previously, as a private caregiver, med tech, health coach & stretch practitioner, Wellness Director, and manager of a health studio, she has been advocating for the health and wellbeing of others for over 10 years. In 2022, Rhiannon joined JTA Wellness to encourage others in their wellness journey toward a healthier and happier lifestyle. She understands the challenges of finding balance in life and creating space for yourself and is here to assure you that JTA Wellness is a vital part of your wellness journey.
Outside of JTA, Rhiannon is a special needs caregiver. She is also a stepmother to three wonderful sons. She believes that time is the most valuable gift you can give, so she spends most of her free time visiting with family. Some of her favorite hobbies are Zumba, hiking, fishing, and watching her stepsons enjoy the new-tritious foods she cooks.
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. Being a pillar of the community is very important to her as she is happy to be able to provide partnership and assistance to our patients and professional team in English and Spanish. She believes a mix of being informed, continually educating yourself in healthy techniques and investing in your well-being physically, mentally, and emotionally is the key to living your absolute best and fulfilling life.
Outside of work she enjoys day trips, exploring the city with her son, listening to podcasts about self-care, finding decorating ideas and being in her hometown of New Braunfels with her family.
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. With her experience assisting with marketing activities, podcast production, and managing all relationships and interactions within the company alongside the CEO's she looks forward to helping JTA Wellness increase awareness and the connection within the community. She enjoys working together and making an impact on all patients' well-being by attending company events, visiting clinics, and meeting with physicians.
In her spare time, she enjoys spending time with her husband and their four-legged best friend.
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.
Her journey into holistic health began with personal health challenges in childhood, sparking a lifelong appreciation for natural healing. Clarissa’s compassion and empathy create a safe, nonjudgmental space where others feel seen, heard, and supported. She finds true joy in helping others and spreading kindness wherever she goes.
In her free time, you’ll likely find Clarissa in the kitchen, creating nutritious meals. As a creative spirit, she also enjoys painting and crafting as a way to unwind. She cherishes time with her daughter and strives to lead by example, embracing a healthy lifestyle for a thriving future. Whether basking in the sun reading a book or enjoying the comforts of home, Clarissa finds peace in the simple things.