Expert providers dedicated to your health
Our team combines decades of experience in functional medicine, integrative health, and compassionate patient care. We’re here to listen, understand, and guide you toward optimal wellness.
30+
Years Combined Experience
2,000+
Patients Served
15+
Board Certifications
98%
Patient Satisfaction
Who We Are
Medicine that
sees the whole you
Apostol Integrative & Functional Medicine was founded on a simple belief: healthcare should be personal, comprehensive, and focused on uncovering root causes rather than masking symptoms.
Our approach combines the precision of modern medicine with the wisdom of functional and integrative practices. We don’t just treat diseases—we treat people, with compassion, expertise, and an unwavering commitment to your long-term wellness.
Every member of our team shares this vision. Together, we create a collaborative environment where your health story is heard, your questions are answered, and your path to optimal health is built specifically for you.
The Team
Meet your care providers
Each provider brings unique expertise, advanced training, and a shared commitment to helping you achieve lasting wellness through personalized, root-cause medicine.
Dr. Margaret Apostol
MD, Board Certified in Family Medicine
— Dr. Margaret Apostol
Dr. Margaret Apostol is a board-certified family physician with a deep-rooted passion for health, prevention, and personalized medicine. Her journey into medicine began with an undergraduate degree in Nutrition Sciences, where she entered college with the belief that medicine and health were inseparable. While medical school and residency provided a strong foundation in conventional care, she soon realized that modern medicine often focuses more on disease management than true health optimization and prevention. This realization shaped her desire to expand beyond traditional models of care.
For the past seven years, Dr. Apostol has practiced integrative and functional medicine, combining the best of conventional medicine with a root-cause, systems-based approach to healing. She is passionate about identifying and addressing the underlying drivers of illness rather than simply managing symptoms. By using a broader toolbox that includes nutrition, lifestyle medicine, advanced testing, and targeted therapies, she helps patients achieve sustainable health and vitality. Dr. Apostol finds deep fulfillment in filling the gaps where conventional medicine falls short, empowering her patients to take control of their health and thrive.
Tabatha Durand, CNP, FNP-C, APHN-BC, HWNC-BC
board-certified family nurse practitioner
“The art of medicine needed restoring.”
— Tabatha Durand, CNP, CEN, TCRN
Tabatha Durand is a board-certified family nurse practitioner. Noticing that depersonalized protocols increasingly drove healthcare, Tabatha recognized that the “art of medicine” needed restoring. Until then, she determined to continue her education (perpetually) to protect her clients from competing interests.
Tabatha graduated summa cum laude with her master’s in nursing. After an internship with Apostol IFM, she was eager to return to offer root cause care. A firm believer in the human spirit and a witness to the negative impacts of sick-care, Tabatha continues to advocate for her client’s best interests hoping that each life change elevates humanity.
Eric Croucher, MSN, APRN, FNP-C
Family Nurse Practitioner | Apostol Functional & Integrative Medicine
— Eric Croucher, MSN, APRN, FNP-C
Eric Croucher is a board-certified Family Nurse Practitioner with a distinctive clinical background in neurology, cardiothoracic critical care, and integrative wellness. Before transitioning to functional medicine, he practiced in Level I trauma and transplant ICUs and later specialized in neurology, managing complex conditions including epilepsy, Parkinson’s disease, dementia, and multiple sclerosis. This multidisciplinary foundation allows him to recognize the deep connections between neurological, metabolic, and emotional health—partnering with patients to develop personalized treatment strategies that blend evidence-based medicine with nutritional, hormonal, and lifestyle interventions.
Eric earned his Master of Science in Nursing from the University of Texas at Arlington and his Bachelor of Science in Nursing from Texas A&M University. A three-time nationally certified critical care registered nurse with certifications in cardiac surgery and cardiac medicine, he has been recognized with the Daisy Award and graduated as Class Valedictorian. His mission is to help patients achieve balance, resilience, and lasting wellness through compassionate, root-cause care.
Jamie Langston, MSN, AGNP-C, CCRP
ReCODE 2.0 Certified, SOCRA Certified
“I believe in walking beside each individual on their health journey while merging clinical expertise with meaningful connection.”
— Jamie Langston, MSN, AGNP-C, CCRP
Jamie Langston is a board-certified Nurse Practitioner with over 30 years of experience in adult and geriatric care, and more than a decade dedicated to advancing research in cognitive health and dietary supplements.
Jamie is ReCODE 2.0 Certified and SOCRA Certified, She brings a deep understanding of evidence-based strategies for cognitive optimization and prevention of cognitive decline.
Her background includes extensive clinical research, peer-reviewed published publications, and leadership in both patient-centered care and interdisciplinary collaboration.
Jamie partners with patients to co-create personalized plans that empower optimal health outcomes—always grounded in compassion, dignity, and respect.
With a heart for patient advocacy and a passion for promoting lifelong wellness, Jamie believes in walking beside each individual on their health journey while merging clinical expertise with meaningful connection.
Jess House, RN, BSN, CANS
Registered Nurse & Aesthetic Specialist
Jess House, RN, BSN, CANS
Jess House is a highly trained aesthetic injector with over 20 years of experience in the aesthetic field, first as an aesthetician and then as a registered nurse after earning her Bachelor of Science in Nursing from West Coast University. Raised in Los Angeles, Jess spent seven years as a full-time injector before being invited to become an instructor, teaching nurses, midlevels, and physicians injectable techniques and safety protocols. She holds the distinguished honor of being one of the few nurses in the nation to be a Certified Aesthetic Nurse Specialist (CANS)—the only professional certification in the field of aesthetics.
Continuing education is a top priority for Jess to ensure she brings the latest techniques and safety standards to both her patients and students. Outside of work, Jess spends her time on continuing education, cooking, and watching her children compete in wrestling with her husband in Keller, Texas. Her commitment to excellence and patient safety makes her an invaluable member of the Apostol IFM team.
Evidence-based & patient-centered
Root-cause focused
Collaborative partnership
How we approach your care
Our philosophy is simple: listen first, test thoroughly, treat precisely, and stay with you throughout your health journey. We believe in transparency, personalization, and building long-term relationships with our patients.
Every recommendation we make is tailored to your unique physiology, history, and goals. We don’t follow one-size-fits-all protocols—we create individualized care plans designed to help you thrive.