CranioSacral Therapy was discovered by the American Osteopathic Physician 

During his time as professor for biomechanics at Michigan State University he teamed up with a group of scientist (anatomists, physiologists, biophysicists and bioengineers) to establish the science behind the concept that he later named "CranioSacral Therapy".
William G. Sutherland, DO, was the instigator of this research. In the 1920s he challenged the widely spread assumption that the cranial bones fuse after birth. He found that this was not the case. This was the basis for what is now known as "Cranial Osteopathy", where the focus is on the "sutures" or articulations between the cranial bones. 
Dr. John E. Upledger put emphasis on the answer to the question, "why do the cranial bones need to move and what moves them?"
His research showed that the driving force behind what is now called "CranioSacral Rhythm" is a fluid (cerebrospinal fluid), produced in the ventricles of the brain. This fluid nourishes and protects the brain. His team of scientists also discovered the function of the membrane system surrounding the brain and spinal cord, as a semi-hydraulic system. This membrane system is shaped like a tadpole, envelopes the brain and spinal cord and is filled rhythmically with cerebrospinal fluid, which is absorbed and drained back into the blood circulation. If this rhythmical motion is reduced due to restrictions between the cranial bones or the membrane system surrounding the Central Nervous System, our body develops symptoms and becomes ill.
CranioSacral Therapy focuses on alleviating these restrictions, enabling the Central Nervous System to function at a higher level and assisting the body to self-correct.