Our Mission

Deliver the industry’s most respected diagnostics, research, and educational support providing practitioners with actionable data from a partner they can trust resulting in informed, science-based diagnostic and wellness strategies tailored to each patient’s unique challenges and environment.

Our History

For over 25 years, we have been pioneering functional medicine testing. First as Great Plains Laboratory and now as Mosaic Diagnostics, our comprehensive testing solutions help identify the root causes of chronic health conditions. If you liked us as Great Plains Laboratory, you’re going to love ​working with us as Mosaic Diagnostics.

A Partner You Can Trust

Our commitment to ensuring accuracy, reliability, and quality in all our tests, combined with our efforts to educate and support practitioners, make MosaicDX a leader in functional medicine testing.

About Mosaic Diagnostics


Rely on our CLIA-certified and clinically validated tests for confidence in your lab results.

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Trust our experienced clinical teams to deliver accurate and reliable test results in a timely manner.

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Benefit from a wealth of expertise accumulated over 25+ years of research and data analysis.

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Strengthen practitioners’ ability to uncover the root cause of health issues through education and clinical guidance.

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Personalized support tailored to meet the unique needs of your practice and patients.

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A straightforward, uncomplicated testing process that minimizes hassle and maximizes efficiency.

Leadership Team

Michael Gandy

Chief Financial Officer

Dan Stein, MD

Chief Science Officer

Nichole Johnson

Chief Operating Officer

Jay Feldman

Chief Information Officer

Tim Arndt

VP, North American Sales

Natalie Lesieur-Molak

VP, Marketing

Meet Our Clinical Development Team

At MosaicDX, we prioritize your success in applying clinical insights provided by our testing. That’s why our clinical support team, consisting of medical doctors, naturopathic doctors, doctors of clinical nutrition, and registered dietitians, is here to assist you every step of the way.

With an active MosaicDX practitioner account, you gain access to one-on-one virtual consults with our clinical educators.

  • Result Interpretation: Gain a deeper understanding of test results and their implications for personalized patient care.
  • Follow-Up Testing Strategies: Receive guidance on implementing effective follow-up testing strategies based on patient results.
  • Test Selection and Application: Get recommendations on selecting the most appropriate tests for your patients’ specific needs and applying them effectively.
  • Additional Testing Options: Discover a range of supplementary testing options that can further broaden your clinical insights and enhance patient care.

Teresa McBride, ND

Director of Clinical Development
Dr. McBride is a board-certified naturopathic physician with over 25 years’ experience in various settings including clinical practice, medical education, research, and laboratory diagnostics she brings unique and practical insight to Mosaic’s product and educational offerings. Driven by the belief that healthcare should be more than just disease management, she is committed to finding ways to improve healthcare through novel solutions and efficacious treatments. Her consulting practice centers around personalized care employing nutrition, lifestyle modifications, as well as botanical and homeopathic medicines to effectively address both acute and chronic conditions.

Michelle Maddux, ND

Senior Manager, Clinical Development
Dr Michelle Maddux received her Doctorate of Naturopathic Medicine from Sonoran University of Health Sciences (formerly SCNM) and her Bachelor of Science in Business Management from the University of Phoenix. She has completed additional training in integrative and functional medicine, laboratory medicine, eating disorders, meditation, yoga, and mindfulness. Her clinical practice focuses on teaching highly functioning women to take care of themselves no matter how messy life gets. Dr. Maddux has been an educator in the Functional and Integrative laboratory space for over a decade and is happy to continue learning and sharing knowledge as part of the Mosaic Diagnostics team.

Pam Gilford, MA, CCN

Clinical Educator
For over 15 years, Pamela Gilford has been a nutritional consultant for Mosaic Diagnostics (The Great Plains Laboratory), helping practitioners and patients better understand test results and serving as a resource for dietary and treatment options. Pam has a Masters in Biochemistry from the University of Kansas, as well as experience as a pharmaceutical researcher. She spent 10 years with Midwest Research Institute in Kansas City as an environmental scientist involved in exposure assessment and evaluation of toxic compounds. She is also a Certified Clinical Nutritionist (CCN), which has allowed her to incorporate integrative and functional medicine approaches in her consultations.

Steven Imgrund, MS, CNS, LDN

Clinical Educator
Steve Imgrund is a Licensed Dietician Nutritionist and Certified Nutrition Specialist in Illinois, with a Master’s degree in human nutrition from Bridgeport University. With experience in marketing, product development within the supplement industry, and private practice, Steve brings a wealth of knowledge to his role on the clinical team at Mosaic Diagnostics. He is excited to be the newest member of the team, aiding other practitioners in interpreting and contextualizing their patients’ integrative testing.