About Kresser Institute

The Kresser Institute was founded in 2015 by Chris Kresser, MS, LAc, a renowned expert, entrepreneur, clinician, and educator in the fields of Functional Medicine and ancestral health. Chris mentored and partnered with Tracey O’Shea, FNP to build the certification program into what it is today. Under her direction and ownership. It’s mission is to provide the next generation of Functional Health practitioners with the skills, tools, and training they need to turn the tide of chronic disease—and change the future of medicine.

The Kresser Institute offers Functional Medicine programs and courses—the ADAPT Functional Medicine Practitioner Fellowship and Certification Program and ADAPT Functional Medicine Training Courses, both of which offer comprehensive education and training in Functional Medicine and ancestral nutrition and lifestyle.

The ADAPT Framework represents a collaborative model of care that integrates Functional Medicine with an ancestral, evolutionary perspective, allowing practitioners and allied health professionals to:

  • Prevent and reverse chronic disease, instead of just managing it.
  • Offer a vital (and often missing) layer of support to help your patients or clients make lasting diet, lifestyle, and behavior changes.
  • Play a part in reducing healthcare costs for governments, organizations, and individuals.
  • Work as part of a collaborative network of practitioners, health coaches, and allied health professionals who support your goals.
  • Embrace and build an inspiring, meaningful, rewarding career.

To date, the Kresser Institute has trained more than 2,000 health professionals around the world, serving clinicians and allied health professionals who want to truly make a difference in the lives of their patients and clients—and play a critical role in shifting from outmoded, conventional methods to a new paradigm that draws on the following framework: 

  • Functional Medicine, which seeks to treat the underlying cause of disease, rather than simply suppressing symptoms
  • Ancestral nutrition and lifestyle, which resolves the mismatch between our genes, our biology, and our modern environment
  • Health coaching, which seeks to support and empower people to make sustainable lifestyle and behavior changes 
  • A collaborative practice model that links allied health professionals with licensed providers to better serve patients and create more sustainable practices

Our comprehensive virtual training courses are presented by Tracey O’Shea, FNP along with her faculty of world-renowned clinicians and allied health professionals, all of whom deliver insights into how to build and manage an effective practice and professional career while integrating Functional Medicine and ancestral health. Graduates of the Kresser Institute don’t just learn a set of skills, but join an interconnected and vital community of practitioners and allied health professionals who have been trained in the same paradigm.  

Together, we can reinvent healthcare and turn the tide of chronic disease. The Kresser Institute considers itself a critical force in helping mission-inspired health professionals become part of the revolution—and change the face of modern medicine.


Our faculty are experts and thought leaders in Functional Medicine. To see the full list of faculty members and learn more about their background and expertise, please visit this page.

Tracey O'Shea
Tracey O’Shea, MSN, FNP-C, IFMCP
Owner and Executive Director
Chris Kresser, MS, LAc
Founder and Board Member
Lindsay Christensen
Lindsay Christensen, MS, CNS, LDN, A-CFHC
Faculty Member
Sunjya Schweig, M.D.
Faculty Member and Clinical Advisor


Writing Team

Our writers are diverse experts across a variety of fields. Chris Kresser, MS, LAc, is a leader in Functional Medicine and ancestral health. He is a New York Times best-selling author, founder of Adapt Naturals, co-director of the California Center for Functional Medicine, and the creator of the ADAPT Functional Medicine Practitioner Training Program and Health Coach Training Program. If you want to find more information about how we create and edit our content, please see this page.

Chris Kresser
M.S., L.Ac.
Tracey O’Shea
Lindsay Christensen
Lindsay Christensen

Advisory Board

The members of our Advisory Board are experts in fields like health coaching, Functional and integrative medicine, nutrition, and more. They help ensure that we bring you accurate information to incorporate into your Functional Medicine practice, to implement in your health coaching, or to help you stay up-to-date with the emerging research. See all board members here.