About Our Professionals

About Environmental Health Center – Dallas Professionals

Elizabeth Seymour, M.D. is a family and functional medicine physician who joined the staff of the Environmental Health Center in 2015. She learned, witnessed, employed and experienced the techniques and knowledge of Dr. Rea as together they examined patients. She has served as a Telemedicine physician, an Emergency Room Physician, and as a Medical Director.

Dr. Seymour earned her B.S. in Biology at Texas Woman’s University in Denton, TX where she graduated Magna Cum Laude and was a member of the Phi Theta Kappa Honor Society. She earned an M.S. in Health Services Administration at St. Joseph’s College in Standish, Maine, and her medical degree at St. Matthews University School of Medicine, Grand Cayman, British West Indies. Her Postdoctoral Training was with Oklahoma University Health Sciences Center in Oklahoma City, Oklahoma as an Intern in Family Medicine from July 2006 – June 2007 and as a resident in Family Medicine from July 2007 – June 2009.

She is vitally involved in the community serving as Board Chair for the Denton Area Teacher’s Credit union, as President of the Denton County Medical Society, and as a board member of Medical City Denton Hospital. She has served on the Committee to Keep Denton Beautiful and on the Texas Dept. of Insurance Advisory Committee for the Standard Request Form for Prior Authorization of Medical Care or Health Care Services. She also was the Chairperson on the Health Care innovation Challenge Grant Review, Center for Medicare and Medicaid Innovation. Since 2009 Dr. Seymour has been a Rotary Member, Denton, TX.

Her community service has seen her serve as a volunteer for the Special Olympics, and as a Stephens County Science Fair Judge. She served on the Citizen’s Advisory Committee for Denton ISD, Secondary Schools subcommittee. She was a volunteer assisting in the Integris Oral, Breast, and Prostate Cancer Screening. She has also been an Emergency Room Volunteer for the Denton Regional Medical Center.

She was appointed to serve on Leadership America in 2018. From July 2016 to May 2017 she served on the Texas Medical Association, Leadership College. She was appointed to serve from March 2012 to February 2014 on the Texas Academy of Family Physicians, National Conference of Special Constituencies (NSCS), and as an International Medical Graduate Delegate. From May 2012 – May 2014 she was appointed to serve as a Delegate to the Texas Medical Association’s Council on Practice Management Services. She was appointed to the Leadership Texas Class of 2014, and from 2013 – 2014 she served on Leadership North Texas Class V. From 2012 through 2014 she served on the Leadership Denton Class 2013. In 2010 – 2011 she was appointed to serve on the Duncan Class VX as a Graduate.

Dr. Seymour along with Long, R., and Mold, J. has published in the Evidence-Based Practice, volume 13.1 (January 20010):4 the article “Osteoarthritis of the knee: Who is most likely to benefit from intraarticular corticosteroid injections, and for how long?”

She is a member of the American Academy of Environmental Medicine, the Institute of Functional Medicine, the American Medical Association, the Texas Medical Association, and the American Academy of Family Physicians, The Texas Academy of Family Physicians, and the Denton County Medical Society.

Dr. Seymour is board certified by the American Board of Family Medicine and is certified by the Institute of Functional Medicine. She is a fellow of the American Academy of Family Physicians.

Dr. Seymour is a vital member of the staff of the Environmental Health Center-Dallas and is dedicated to restoring and preserving the health and well-being of its patients.


Stephanie McCarter, M.D. Stephanie McCarter is an internal medicine and environmental medicine physician at the Environmental Health Center of Dallas. She has 13 years of experience in the field of environmental medicine and has built her own eco-friendly, low-EMF home, working with well-known experts in healthy house building, including David Rousseau and Tang Lee of Canada, and Mary Oetzel in Texas. She has lectured on Environmental Medicine in the areas of indoor/outdoor air quality, avoiding pollutants in air, food and water, evaluation and treatment of electromagnetic field sensitivity, and on preparing antigens for provocation/neutralization immunotherapy.

Dr. McCarter has been acknowledged for her work on Dr. William Rea’s book, “Reversibility of Chronic Degenerative Disease and Hypersensitivity, Vol. 1. She has extensive experience with electromagnetic sensitivity, lecturing on the subject at the University of Texas Dallas in March of 2017, the American Academy of Environmental Medicine Spring conference in April, 2015 and at the 25th and 28th Annual International Symposiums on “Man and His Environment in Health and Disease.”

Dr. McCarter is board certified in Internal Medicine and is a member of the American College of Physicians and the Alpha Omega Alpha medical society. She graduated from Indiana University School of Medicine in 1993 and from Pepperdine University in 1989.

Dr. McCarter believes that the body is an energetically open system that is exchanging energy and materials with its surrounding environment and must be treated as such to achieve total wellness. She strongly believes such treatment should be of the whole body, mind, and spirit.


William J. Rea, M.D., who passed away on August 16, 2018, was a cardiovascular surgeon with a strong passion for the environmental aspects of health and disease. Founder of the Environmental Health Center (EHC-D), Dr. Rea was the director of this highly specialized Dallas based medical facility.

In 1988, Dr. Rea was named to the world’s first professorial chair of environmental medicine at the Robens Institute of Toxicology at the University of Surrey in Guildford, England. He was also awarded the Jonathan Forman Gold Medal Award in 1987 and the Herbert J. Rinkel Award in 1993, both by the American Academy of Environmental Medicine, as well as named Outstanding Alumnus by Otterbein College in 1991. He was also named to the Mountain Valley Water Hall of Fame for work in the field of study of clean water and, in 1995, he received the F.A.M.E. Award for pioneering work in environmental and preventive medicine. In 1997 he was named International Man of the Year and in 2002 Dr. Rea received the O. Surgeon English Humanitarian Award from Temple University.

Author of the medical textbooks, Chemical Sensitivity, Vol. 1-4, co-author of Reversibility of Chronic Degenerative Disease and Hypersensitivity, V. 1: Regulating Mechanisms of Chemical Sensitivity, Reversibility of Chronic Degenerative Disease and Hypersensitivity, V. II: The Effects of Environmental Pollutants on the Organ Systems, Reversibility of Chronic Degenerative Disease and Hypersensitivity, V. III: Clinical Environmental Manifestations of the Neurocardiovascular Systems, a home building book, Optimum Environments for Optimum Health and Creativity, and co-author of Your Home, Your Health and Well-Being, Dr. Rea has published more than 100 peer-reviewed research papers related to the topic of thoracic and cardiovascular surgery and environmental medicine.

Born in Jefferson, Ohio, Dr. Rea graduated from Otterbein College in Westerville, Ohio, and Ohio State University College of Medicine in Columbus, Ohio. He then completed a rotating internship at Parkland Memorial Hospital in Dallas, Texas. He held a general surgery residency from 1963-67 and a cardiovascular surgery fellowship and residency from 1967-69 with The University of Texas-Southwestern Medical School system, which includes Parkland Memorial Hospital, Baylor Medical Center, Veterans Hospital and Children’s Medical Center.

From 1984-85, Dr. Rea held the position of adjunct professor of environmental sciences and mathematics at the University of Texas, while from 1972-82, he acted as clinical associate professor of thoracic surgery at The University of Texas Southwestern Medical School. He has also served as chief of thoracic surgery at Veterans Hospital and as adjunct professor of psychology and guest lecturer at North Texas State University.

Curriculum Vitae- Rea
Patient Reviews


Ron Overberg, Ph.D., C.C.N. (certified clinical nutritionist), works with the nutritional deficiencies associated with a specific diagnosis, or with medications and their interactions. He also offers alternatives to medication when a good, safe, and effective choice is available. Dr. Ron can be reached through the EHC-D clinic, on the web, or email [email protected].


Carolyn Gorman, M.A. is a health educator, widely recognized in the field of environmental medicine and allergies. She received a Master’s Degree in Health Education from Texas Woman’s University in Denton, Texas, and has been actively involved in clinical and environmental health education in the Dallas area since 1983.

Mrs. Gorman is the author of books and booklets for the chemically sensitive, allergic, environmentally ill, and those concerned about protecting our environment. She is co-author of the Mother Earth Handbook. Her other books are Less Toxic Alternatives, Our Fragile World, Fungus, Molds, and Mycotoxins, and Pollen and Dust.

Richard Jaeckle, M.D., a native Texan, completed high school and university in San Antonio, Texas. He attended medical school at the University of Texas Southwestern Medical School in Dallas, Texas, graduated in 1961, and then completed a straight medicine internship there. Missionary interests led to philosophy and theology, followed by two-years in central and southern Brazil. Dr. Jaeckle then returned to the USA for residency training in psychiatry from 1969 to 1972 at St Louis University Hospitals, fellowship in child psychiatry at Washington University Child Guidance Clinic from 1972 to 1974, and then opened his private practice. A life-changing five and one–half years of psychoanalysis during those years prompted his return to Dallas in 1968 and the Dept of Psychiatry, Child Division, for two years.

His Dallas private practice opened in 1980 at the current location. He extended his long interest in Allergy further to Environmental Medicine, which includes nutrition, toxicology, endocrinology, and immunology and other related areas. Dr. Jaeckle has just celebrated his fortieth year of patient care in Psychiatry.

Dr. Jaeckle's life was transformed in 1957 by learning first-hand the benefits of allergy shots and then tracking food allergy for over 47 years. Subsequently, after a mold-induced immune disorder in 1964, he gained insight to the impact that the environment can have on a person's total health. These experiences led him to complete post-graduate courses in Allergy and Environmental Medicine starting in 1989. Shortly thereafter, Dr. Jaeckle worked with the Pan American Allergy Society, teaching courses and holding Board roles including President and CME director. Additionally, Dr. Jaeckle has worked with the American Academy of Environmental Medicine, giving lectures and teaching courses in food allergy, in addition to serving on the Board as Secretary. Since 2007, he has been associated with Pharmasan Laboratory, for whom he has conducted extensive urinary neurotransmitter testing on his patients. This testing has uncovered many opportunities for psychiatric treatment beyond conventional methods.

Dr. Jaeckle continues to be enriched by ongoing studies of the internationally recognized gastroenterologist Fuad Lechin MD, PhD, who has to his credit over forty years of research, over two hundred and forty publications, and nomination for the Nobel Prize in Medicine in 2001. He is especially influenced by Dr. Lechin's 2002 publication "Neurocircuitry and Neuroautonomic Disorders," and his 2009 publication of "Crosstalk Between the Autonomic and Central Nervous Systems."

This wealth of experience brings a unique perspective to Dr. Jaeckle's practice of Psychiatry, serving the whole body, mind, and person."

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