Our Clinicians
Root Cause clinicians review the information you submit and make LMN decisions based on their clinical judgment.
Clinical Leadership
Meet the lead clinicians who shape how Root Cause reviews are conducted, grounded in functional medicine and independent clinical judgment.
MD, FACP, IFMCP, Dipl. ABIM, Dipl. ABOM · Medical Director
Medical Director at Root Cause Functional Medicine. Board-certified in Internal Medicine and Obesity Medicine, with advanced training in Integrative Medicine through the University of Arizona and certification from the Institute for Functional Medicine. A graduate of Wayne State University School of Medicine, she focuses on identifying and addressing the root causes of chronic disease.
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DNP, APRN, AGNP-BC · Adult-Gerontology Nurse Practitioner
A Doctor of Nursing Practice, board certified nurse practitioner, and founder of East x West Med. Columbia University graduate with additional training through the American College of Lifestyle Medicine, Hormone Health Institute and Institute of Functional Medicine, she brings a functional, root-cause approach to women's health and longevity.
View LinkedIn profile →Wherever you live, your review is handled by a clinician licensed in your state. Root Cause serves all 50 states.
Independent, licensed practitioners: physicians, nurse practitioners, and physician assistants.
Brittni Kalyuzhny, FNP-BC
Family NP (FNP-BC) · Functional medicine
ANCC board-certified family nurse practitioner with functional medicine training. MSN, Wagner College.
Kristina Frederick, PA
Certified Physician Assistant
Physician assistant in family, emergency, and functional medicine. PA, Essex Community College.
Shannon Chatham, DO
Family medicine (DO)
Board-certified in family medicine (ABOFP), focused on telemedicine. DO, West Virginia School of Osteopathic Medicine.
Kerri Bryan, PA-C, CAQ-Psychiatry
Physician Assistant · Psychiatry
NCCPA-certified physician assistant with a CAQ in psychiatry. BS, Mountain State University.
Zhanna Leib, PA-C
Certified Physician Assistant
Certified physician assistant in addiction medicine and behavioral health. PA, Franklin Pierce University.
Why Our Clinicians
Clinicians make recommendations based on clinical context, outside of patient intent.
Our clinicians are independent MDs, NPs, and PAs, licensed in the states where they review.
Our clinicians' decisions are based on documented conditions and health context. And not anything else.
Every LMN review is conducted by a real, experienced clinician.
