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25 Top Mold Doctors You Should Know If You Suspect Mold Illness

by , | Mar 14, 2026 | Mold and Health

Every year, millions of Americans live and work in buildings with hidden water damage. Behind drywall, beneath floors, and inside HVAC systems, toxic mold grows quietly—releasing mycotoxins that can wreak havoc on the human body.

Conventional medicine has been slow to accept mold illness as a real diagnosis.

The result? Patients are misdiagnosed, dismissed, or simply told their symptoms are stress-related.

For people struggling with unexplained fatigue, brain fog, chronic pain, or autoimmune symptoms, mold illness is often the hidden culprit. After years of being dismissed by conventional medicine, a growing group of clinicians has stepped in to connect mold and water‑damaged buildings with chronic inflammatory illness.

But a growing community of physicians, researchers, and environmental health specialists has pushed back. These doctors have treated thousands of people who were turned away by mainstream medicine. They developed the diagnostic tests, built the clinical protocols, published the research, and spoke up when few others would.

“Mold toxicity is one of the biggest epidemics that hasn’t been talked about,” says Dr. Neil Nathan, one of the leading figures in this field. “Like Lyme, mold is the great masquerader.”

This article profiles 25 leading mold doctors and mold‑illness experts, expanding on the core list you provided and adding context, specialties, and links so readers can explore each clinician’s work in more depth.

1. Dr. Ritchie Shoemaker — Pioneer of CIRS Medicine

Dr. Ritchie Shoemaker is the single most important figure in mold illness medicine. A family physician originally based in Maryland, he developed the CIRS model after treating patients who became chronically ill following biotoxin exposure.

He recognized that mold and other biotoxins from water-damaged buildings triggered the same cascading inflammatory response he was documenting in other patient populations.​

His Shoemaker Protocol—a systematic 12-step treatment plan—has become the global standard for diagnosing and treating biotoxin illness. The protocol includes Visual Contrast Sensitivity (VCS) testing, specific biomarker panels (MSH, TGF-beta-1, VEGF, C4a, MMP-9), removal from exposure, cholestyramine binders, and step-wise immune restoration. He has published dozens of peer-reviewed papers and trained certified practitioners on every inhabited continent.

His work is the scientific and clinical foundation upon which nearly every other practitioner on this list has built their practice.

He has also been a guest on podcasts discussing how Jordan Peterson and other public figures helped publicize CIRS as a legitimate diagnosis with real biological pathways.

2. Dr. Neil Nathan — Environmental Medicine Author and Pioneer

Dr. Neil Nathan practices in Northern California and has lectured internationally on mold toxicity as a major, underdiagnosed driver of chronic illness. He estimates that at least 10 million Americans currently suffer from some degree of mold toxicity and emphasizes that the illness can present differently in every person depending on genetics and biochemistry.

His diagnostic approach begins with a urine mycotoxin test and places heavy emphasis on removing patients from mold-contaminated environments before any treatment can succeed. He has also identified a critical clinical insight: patients with Lyme disease respond far better to treatment once their mold illness is addressed first. He found that roughly 70% of leading Lyme physician Dr. Richard Horowitz’s patients were also dealing with mold issues.​

Dr. Nathan is the author of the bestselling books Mold and Mycotoxins: Current Evaluation and Treatment (2016) and Toxic: Heal Your Body from Mold Toxicity, Lyme Disease, Multiple Chemical Sensitivities and Chronic Environmental Illness.

3. Dr. Mary Ackerley — Neuropsychiatric Mold Illness Pioneer

Dr. Mary Ackerley is a Harvard- and Johns Hopkins-trained psychiatrist who became one of the field’s most important voices in mold-related neuropsychiatric illness. She is co-founder and former president of the International Society for Environmentally Acquired Illness (ISEAI).​

Her landmark 2014 paper, Brain on Fire: The Role of Toxic Mold in Triggering Psychiatric Symptoms, described how mold mycotoxins can trigger cytokine-driven neuroinflammation—producing anxiety, depression, rage, suicidal ideation, and psychosis in susceptible individuals. She has found that many patients who failed to respond to SSRIs and standard psychiatric medications had undiagnosed biotoxin illness as the root cause.​

“The inhalation of contaminants from a water-damaged building can quickly induce psychiatric symptoms such as anxiety, rage, and suicidal ideation,” Dr. Ackerley wrote in her letter to the Australian Parliament. She obtained Shoemaker Protocol certification in 2013 and has since treated over 1,000 patients with CIRS.

4. Dr. Scott McMahon — Pediatric CIRS Specialist

Dr. Scott McMahon is a pediatrician based in Roswell, New Mexico, who became one of the country’s leading CIRS practitioners after a businessman approached him about his daughter becoming ill at a local school.

That case led him directly to Dr. Shoemaker’s practice, where he trained. He returned to Roswell, opened a CIRS-dedicated clinic starting with 15 patients from the affected school, and has since treated thousands of adults and children.​

Dr. McMahon is a frequent expert witness in mold-injury legal proceedings and serves as a testifying medical expert, having described in detail the injuries toxic mold causes to children and adults.

He has collaborated extensively with Dr. Sandeep Gupta on diagnosing CIRS in pediatric populations—a critical area where mold illness is regularly misidentified as ADHD, anxiety, or developmental delay.

His work includes using Visual Contrast Sensitivity (VCS) testing and biomarker panels to screen children.

5. Dr. Lisa Nagy — Environmental Medicine and Chemical Sensitivity Specialist

Dr. Lisa Nagy is the Medical Director of the Environmental Health Center of Martha’s Vineyard and one of the most outspoken advocates for environmental medicine in the United States. She has testified before the Congressional Subcommittee on Veterans’ Health, spoken at the NIH, lectured at the University of Pennsylvania Medical School, and was the keynote speaker on mold’s health effects after Superstorm Sandy in New York City.​

She is Communications Liaison for the American Academy of Environmental Medicine, Vice Chair of the Integrative Medicine Consortium, and serves on a roundtable on Building and Health at the NIH. Dr. Nagy has a personal connection to mold illness—she has spoken publicly about how her own family became sick from mold exposure and how that experience shaped her practice.

Her clinical focus covers mold toxicity, chemical sensitivities, chronic fatigue, Lyme disease, and hormonal insufficiency in the country’s most medically complex patients.

6. Dr. Jill Carnahan — Functional Medicine Survivor and Mold Expert

Dr. Jill Carnahan is a board-certified functional medicine physician, cancer survivor, and mold illness survivor. A flood in her Colorado office left hidden mold growing in the walls, producing months of unexplained symptoms before she discovered mold was the cause. Her personal experience now informs her entire approach.​

She uses a “toxic bucket” metaphor to explain individual susceptibility: everyone has a different bucket capacity, and for those with autoimmune disease or prior illness, mold can be the final drop that causes overflow. Dr. Carnahan connects mold toxicity to mast cell activation syndrome, gut dysbiosis, bone health, and occult infections. She is the author of Unexpected: Finding Resilience through Functional Medicine, Science, and Faith and has developed a physician-led mold detox protocol.

7. Dr. Joseph Brewer — Infectious Disease Physician and Mycotoxin Researcher

Dr. Joseph Brewer is a Kansas City-based infectious disease specialist who published some of the most important early research connecting mycotoxins to Chronic Fatigue Syndrome. His landmark 2013 study found that 93% of ME/CFS patients (104 of 112) tested positive for one or more mycotoxins in their urine—compared to zero of 50 healthy controls.​

His research also introduced the concept of the sinus as an internal mold reservoir: mold growing in sinus biofilm communities can continuously generate mycotoxins, explaining why some patients fail to recover from mold illness without targeted antifungal sinus treatment. He co-authored his foundational mycotoxin work with Dr. Jack Thrasher and Dr. Dennis Hooper.​

Dr. Brewer’s work gave researchers and clinicians a measurable, laboratory-confirmed framework for validating mold illness in patients previously dismissed by conventional medicine.

8. Dr. William Rea — Environmental Medicine Pioneer (1935–2018)

The late Dr. William Rea was a thoracic and cardiovascular surgeon who founded the Environmental Health Center in Dallas, Texas—one of the first hospital-based environmental medicine units in the world. A member of the EPA Science Advisory Board, he was among the first physicians to formally document mold mycotoxins—including trichothecenes, fusarium, ochratoxin, and gliotoxin—as serious clinical health hazards.​

His specially constructed hospital environmental unit used filtered air and chemically controlled rooms to test patients for food, pollen, mold, and chemical sensitivities. His work established the diagnostic and treatment infrastructure for what is now the entire field of environmental medicine. He trained a generation of physicians who continue practicing today. Dr. Rea passed away in August 2018 at age 83, leaving a legacy that shaped every practitioner in this field.​

9. Dr. Tom O’Bryan — Functional Medicine and Hidden Mold Advocate

Dr. Tom O’Bryan is a functional medicine physician who has spoken extensively about hidden mold and mycotoxins in homes, schools, and workplaces. He has emphasized that over 50% of mold is invisible to the naked eye and can circulate through HVAC systems, triggering systemic inflammation and autoimmunity in exposed individuals.​

He routinely tests patients for mold and mycotoxin exposure and argues that mold is a major overlooked driver of chronic disease that mainstream medicine continues to minimize. He has collaborated with Dr. Peter Osborne and other functional medicine leaders on the intersection of mold, mycotoxins, and autoimmune disease.

10. Dr. Peter Osborne — Functional Medicine and Chronic Inflammation Expert

Dr. Peter Osborne has collaborated with Dr. Tom O’Bryan to explore how mold, mycotoxins, and bacterial toxins like lipopolysaccharide (LPS) fuel chronic inflammation and autoimmune disease. In his clinical experience, he has described patients who test negative for mold on standard panels but carry high levels of mold-associated toxins when broader testing platforms are used.​

He advocates for comprehensive environmental testing alongside thorough laboratory work to identify mold as a root cause in patients with difficult chronic illness presentations.

11. Dr. Jill Crista — Naturopathic Doctor and Mold Brain Specialist

Dr. Jill Crista is a naturopathic doctor who has built a national reputation for her work on mold illness and neurological symptoms. She coined the term “mold brain” to describe a state of neurological dysfunction driven by mycotoxin exposure, including brain fog, anxiety, depression, rage, and memory loss.

She frequently collaborates with Dr. Neil Nathan at mold-illness conferences and is widely respected for her ability to translate complex mycotoxin biology into accessible clinical guidance. Her book Break the Mold: 5 Tools to Conquer Mold and Take Back Your Health is a widely used resource for patients and practitioners. Her clinical protocols emphasize nervous system support and detox pathway optimization during mold recovery.

12. Dr. Ann Shippy — Functional Medicine and Mold-Wise Doctor

Dr. Ann Shippy is a Houston-based functional medicine physician and former engineer who brings a data-driven, systematic approach to mold evaluation and treatment. She has treated many patients with mold-related illness and chronic fatigue and has spoken publicly about how mold exposure can initiate or worsen autoimmune conditions.

She stresses the need for a comprehensive environmental history when patients present with multi-system symptoms, and routinely tests for mycotoxins, inflammatory markers, and genetic susceptibility (HLA-DR typing) as part of her work-up. Her clinic produces widely shared patient education resources on mold testing, remediation, and recovery.

13. Dr. Allan Magaziner — Integrative Medicine Physician

Dr. Allan Magaziner is an integrative physician who has treated many patients with mold-related illness.

He frequently discusses how mold can mimic multiple chronic conditions and has been quoted in environmental health articles explaining that mold exposure is regularly missed by conventional doctors who fail to take a thorough environmental history.

His clinical approach consistently emphasizes the necessity of identifying and removing mold sources before recovery can begin.

14. Dr. Bradley Bush — Functional Medicine and CIRS Specialist

Dr. Bradley Bush has specialized in mold, CIRS, and chronic illness, describing in clinical presentations and podcasts how mycotoxins bind to receptors in the brain and immune system—triggering widespread, multi-system symptoms that are frequently misattributed to psychiatric or idiopathic conditions.

He advocates for binders, antifungals, and environmental change as the three pillars of mold illness treatment.

His clinical cases are frequently cited to illustrate how mold can serve as the hidden root trigger behind “unexplained” illness in complex patients.

15. Dr. Joy Senner — Environmental Health Clinician

Dr. Joy Senner is an environmental health clinician and educator who has participated in mold-illness education discussions on how mold exposure can affect hormones, the immune system, and the nervous system. She encourages patients to pair rigorous environmental testing with professional remediation and has spoken against “band-aid” treatments that address symptoms without removing the mold source.

16. Dr. Michael Rosen — Mold-Illness Conference Educator

Dr. Michael Rosen has participated in mold-illness conferences and discussions, emphasizing how mold exposure can manifest in diverse ways—including respiratory, neurological, and immune presentations.

He highlights the importance of pairing environmental remediation with medical treatment and appears regularly in functional medicine and mold-recovery educational circles.

17. Dr. Michael Lenz — Environmental Medicine Physician

Dr. Michael Lenz is an environmental medicine clinician who has treated mold-exposed patients and described the ways toxic mold can trigger chronic inflammatory and neurological symptoms. His work is cited in mold-awareness communities and in patient networks where individuals share information about practitioners experienced with CIRS diagnosis and treatment.

18. Dr. John DeLisi — Functional Medicine Practitioner

Dr. John DeLisi has highlighted mold as a common root trigger for chronic illness in his practice, particularly for patients presenting with chronic fatigue, fibromyalgia-like symptoms, and autoimmune disease.

He advocates for environmental testing as part of standard diagnostic work-ups for any patient with unexplained multi-system illness.

19. Dr. Sandeep Gupta — International CIRS Educator and Specialist

Dr. Sandeep Gupta is one of the world’s leading CIRS educators and practitioners. Based in Australia, he founded the educational platform Mold Illness Made Simple, which has helped train patients and physicians across Australia, North America, and Europe on the diagnosis and treatment of CIRS.​

He has collaborated with Dr. Scott McMahon in webinars specifically addressing mold illness in children—producing accessible clinical guidance for a population where CIRS is frequently misidentified as behavioral, developmental, or psychiatric disorders. His platform uses clear, plain-language teaching to make the Shoemaker Protocol framework accessible to an international audience.

20. Dr. Craig Tanio — CIRS Specialist at Rezilir Health

Dr. Craig Tanio is co-founder of Rezilir Health in Florida, a clinic that has become one of the most comprehensive CIRS treatment centers in the southeastern United States. He is certified in the Shoemaker Protocol and has built a team-based model for treating biotoxin illness—demonstrating how a systematic, protocol-based approach can produce consistent outcomes for patients who have been failed by conventional medicine.​

His clinic has successfully treated patients for mold and toxic exposure for many years and serves as a model for how integrative CIRS care can operate at scale.

21. Dr. Wayne Anderson — Complex Chronic Illness Clinician

Dr. Wayne Anderson practices at Gordon Medical Associates in Northern California alongside Dr. Neil Nathan. He specializes in treating complex chronic illness patients—including those with mold toxicity, Lyme disease, and other biotoxin exposures. He contributes to a team-based integrative model that combines mold testing, infectious disease evaluation, and thorough environmental history to build comprehensive treatment plans for the most medically complex patients.

22. Dr. Keith Berndtson — ISEAI Member and Biotoxin Illness Clinician

Dr. Keith Berndtson is an internist and ISEAI member who has written and lectured on CIRS, mold illness, and the science of biotoxin pathways. He has contributed to the growing clinical literature connecting water-damaged building exposure to multi-system chronic illness. He supports a systematic, biomarker-based approach to diagnosis and treatment consistent with the Shoemaker Protocol framework.

23. Dr. Dennis Hooper — Mycotoxin Research Co-Author

Dr. Dennis Hooper co-authored Dr. Joseph Brewer’s landmark 2013 mycotoxin study in ME/CFS patients—work that helped establish that mycotoxins from mold exposure are measurable, detectable, and clinically relevant in patients with unexplained chronic fatigue.

His contribution to that foundational research helped legitimize urine mycotoxin testing as a standard component of the mold illness evaluation and opened the door for subsequent research in this field.​

24. Dr. Olusegun Oseni — Shoemaker-Certified CIRS Physician (DFW)

Dr. Olusegun Oseni is a Shoemaker Protocol-certified integrative and functional medicine physician at Lung & Sleep Specialists of North Texas in Weatherford, Texas. He is recognized as the only Shoemaker Protocol-certified CIRS and mold physician in the Dallas–Fort Worth area—representing the growing movement of certified mold illness specialists bringing evidence-based care to previously underserved regions.​

His clinic treats CIRS, mold toxicity, and biotoxin-related illnesses including Lyme disease using the full Shoemaker Protocol: from initial exposure identification through biomarker testing, binder therapy, and immune restoration.​

25. Dr. Dean Mitchell — Board-Certified Immunologist and CIRS Clinician

Dr. Dean Mitchell is a board-certified immunologist and allergist at Mitchell Medical Group in New York City. He has trained in Dr. Jill Crista’s mold illness protocols and treats patients with CIRS, toxic mold illness, and biotoxin exposure using a comprehensive immunological work-up.​

He emphasizes that approximately 25% of the population carries the genetic susceptibility that makes them vulnerable to CIRS—and that many of those people spend years or decades without a proper diagnosis. His diagnostic approach includes nasal swab biofilm screening (a 7-second test that can identify resistant nasal bacteria contributing to mold illness), urine mycotoxin levels through Real Time Labs, and targeted antifungal treatment.​

Conclusion

Mold illness has long existed in a gray zone between mainstream medicine and environmental health.

The 25 doctors profiled here have spent careers filling that gap.

From Dr. Ritchie Shoemaker’s foundational science along with Dr. Scott McMahon to Dr. Mary Ackerley’s neuropsychiatric research, from Dr. Neil Nathan’s international advocacy to Dr. Joseph Brewer’s landmark mycotoxin studies, these physicians have built a field from the ground up.

The most important lesson from their collective work is simple: the building is part of the patient. You cannot treat mold illness without addressing the environment. You cannot diagnose it without knowing the right tests.

And you cannot dismiss it—because for the 25% of the population with genetic susceptibility, mold exposure is not a minor inconvenience. It is a life-altering medical emergency that deserves serious, evidence-based medical attention.

If you or someone you know has been suffering from unexplained multi-system illness, these mold doctors represent the best resources available.

Their work matters—and awareness is the first step toward recovery.

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Authors

  • Moe Bedard

    Moe is a certified mold inspector and remediator with 15+ years of experience, founder of Black Mold News, and CEO of Mold Safe Solutions—making him one of the most trusted names in the industry.

  • Chase Bedard is the Lead Science Researcher and Editor for Black Mold News and a graduate of the University of California, San Diego in cell biology. He is also a certified mold inspector and remediator with Mold Safe Solutions, combining scientific training with real-world field experience investigating mold and its health effects in homes and buildings.

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