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About Us

Born in 1931 out of the traumatic WWI experiences of Dr. Thurman Fleet, who could not find solutions to his challenges from traditional medicine and theology, what is known today as Concept-Therapy has evolved into a non-profit educational organization. Grounded in philosophical principles that trace back centuries, Concept-Therapy is a unifying correlation of the fundamental disciplines (Science, Metaphysics, Theology, Psychology, Sociology, and Philosophy). It has been taught continuously at its San Antonio Campus for nearly seven decades, where it has proven itself a viable, workable understanding of living a whole life. Over the course of this remarkable tenure, Concept-Therapy has provided an anchor of support for 1000’s of people aspiring to a life of health, happiness, peace, and success and is now taught in locations across the United States and Canada.


With only a meager formal education and against tremendous odds, Fleet was an ordinary man who aspired to the extraordinary.  As an infantryman, he earned a battlefield commission from the U. S. Army in World War I and became one of the nation’s most highly decorated soldiers of that conflict.  He emerged from the war an “old man” of 23, suffering physically and mentally.  Effects of mustard gas and shrapnel in his skull, and haunting, horrific memories plagued the young hero.  Army doctors offered him little relief and no hope.  With a family to provide for, he began a fascinating odyssey to rebuild his health and life.  His journey led him into the realms of psychology, philosophy, theology, health and healing.  Thurman Fleet regained his health and attended the Texas Chiropractic College, establishing a highly successful Chiropractic Clinic in San Antonio, Texas. Dr. Fleet devoted his life to searching for, organizing and teaching the truth about the human condition in all its complexity.  His legacy is Concept-Therapy.

What We Teach Dr. Fleet

The History and Life of Dr. Thurman Fleet

San Antonio Educational Center

In 1944, Dr. Thurman Fleet began teaching his philosophy to members of various healing professions, primarily chiropractors, and in 1949 he founded the Concept-Therapy Institute, a non-profit educational organization in the state of Texas open to all students interested in the study of this philosophy. He purchased the Aum-Sat-Tat Ranch, located in the Texas Hill Country, as a unique destination for study, collaboration, and contemplation.

CTI plays host not only to instructors delivering Concept-Therapy seminars, area meetings, conventions, and training courses but also to a number of national organizations whose members retreat here in the heart of the Hill Country each year. Visitors and guests are welcome at “The Ranch,” and inquiries are accepted at the Institute Monday through Friday, 9:00 a.m. until 4:00 p.m.

Our Vision

At Concept-Therapy we are building a world where all people are healthy and whole in mind, body and spirit.

Our Mission

Concept-Therapy offers a comprehensive learning opportunity for people aspiring to a life of health, happiness, success and peace.

Board Members

Robin Brunk-Dawson


Leigh Zachary


Robin Brunk-Dawson was introduced to Concept-Therapy in1982 in Clovis, California by the Dawson-Harrison Team. Thus began her life-long study of Universal Laws as presented by Dr. Thurman Fleet in the Concept-Therapy and Conceptology coursework. Through the years Robin held offices in Beam and Pathseeker study clubs, and has most recently served as Chief Pilot of the International On The Beam Club, an active Board position. Her decades-long studies under legacy teaching teams of the Concept-Therapy Philosophy, and a deep personal search for truth, kindled a sincere desire to become a teacher for CTI. Having mentored under her long-time-teacher husband Dr. Bill Dawson after their marriage in 2009, and his teaching partner Dr. Eddie Harrison, The Dawson Team actively presented numerous classes and events at their high-desert Double Triangle Ranch in Weldon, California. They continue to carry the torch by teaching, and mentoring new teachers.

Leigh is a second-generation Beamer taking his first Concept-Therapy class in 1978 from Dr. Herb Dill and Emily (Dill) Mattox. He has taken all of the Concept-Therapy and Conceptology classes and has reviewed them all many times. Regularly attending Beam Club and Pathseeker Club, he has received the Concept-Therapy Commendation Award and is also currently the IOTBC Bombardier. Carrying on the family tradition are his two children who have also begun taking Concept-Therapy classes. He received his BS in Economics (minor in Statistics) from Texas A&M University and is the owner of a financial services company in The Woodlands, TX. He has coached numerous baseball and football teams, been Captain of the Events & Functions Committee for the Houston Livestock Show and Rodeo and his favorite things to do are snow ski, be outside and act like a pro at taking power naps.

Mark Oholendt



Bonnie Jo Chastain


Mark Oholendt is a retired Alliance Manager and Account Executive with the NCR Corporation. Mark graduated summa cum laude from the University of Texas at San Antonio with a BBA in Management.   Mark and his wife Katherine (a retired elementary teacher) first took Concept Therapy in the 1970s, have been happily married for 41 years, and are blessed with three children. They are Pathseekers and have taken all the work. Both are involved as volunteers with the University Health system in San Antonio, engaged in providing pet therapy with their rough collie dogs Prince and Laddie. Mark has taught in over 40 classes and has received the numbered W and Zero awards from CTI.

First introduced to Concept Therapy in 1975 by The Lynn Teaching Team, Bonnie has had all the classes through Cosmic Principles. Born and raised in Davenport, Iowa she now lives in Athens, Georgia where she serves on the Development Authority of Athens/Clarke County. She is also a Master Gardener, giving lectures to civic organizations, garden clubs and governmental departments. She looks forward to being a part of strengthening the Concept Therapy organization so it is available to larger groups of people who are searching for answers.

Ginny Minster

Chief Pilot

Dr. Cassie Mattox, Ed.D.

Board Member

Ginny Minster became a Beamer in 1963. She took her first Concept-Therapy class from pioneer teachers Rev. E.L. Crump and Kathy Calhoun. Her early teachers also included Dr Rudy and Barbara Lynn, Dr Vic and Gwen Loofboro and Char and Emily Mattox. More recently, she has taken classes from Dr Bill and Robin Dawson and the Hardy-Holley-Munger-Oholendt Team. Ginny has served in many of the positions in Beam Clubs and Pathseeker Clubs multiple times. Most recently, she served as IOTBC Chaplain for 2 years and is now the Chief Pilot. Ginny took Teachers Training in 1985 and taught classes in New York state with Millicent (Haight) Munger and Susan Phelps. Ginny received all the awards and earned the prestigious number 385 W Award in 2008. She is retired from a career in nursing as a Psychiatric Nurse Practitioner with specialties in Stress Management Counseling, Teaching Nurses, and facilitating Self-Esteem Workshops. Ginny lives with her husband, Chuck in Pittsford NY and spends the winter months in Hilton Head SC. She enjoys their 3 daughters, seven grandchildren and her activities include golfing, pickleball and knitting.

Dr. Cassie Mattox, Ed.D. The eldest daughter of Charles and Emily Mattox, long-time teachers/proponents/supporters of the philosophy, Cassie brings not only her lived experience of Concept-Therapy, but her seasoned experience as a professional educator. As an educational organization whose mission is to “offer a comprehensive learning opportunity for people aspiring to a life of health, happiness, success, and peace,” Cassie offers her cumulative academic, social, and professional experiences, as well as her desire to give back in service to Life. She lives in Georgia with her daughter their dog and two cats. In her free time, Cassie enjoys volunteering at her daughter’s school, exploring parts of GA, and visiting family and friends back in TX.

Tred Rissacher DC


Dr. Tred Rissacher was introduced to Concept-Therapy in 1972. He has completed all the work and is a certified teacher of Concept Therapy, and his entire family began Concept Therapy in the early 70s and they have completed the entire work through Cosmic Principles. He graduated from Cleveland Chiropractic College in 1988 and has been in the professional chiropractic practice for 33 years. “My relationship with chiropractic and Concept Therapy is the most important aspect of my life.”

Concept-Therapy Institute is a state-chartered, non-profit, federally tax-exempt educational organization as defined in Section 501 ( c ) ( 3 ) of the Internal Revenue Code.

2019 Form 990 for Concept Therapy Institute Inc.

2020 Form 990 for Concept Therapy Institute Inc.

2021 Form 990 for Concept Therapy Institute Inc.