PSI was founded in 1973 by Thomas Willhite and Jane Willhite, the company is based in Clearlake Oaks, California. Jane and Thomas Willhite also founded the non-profit PSI World.
In 1983, Thomas Willhite died in a plane crash when his bi-plane went down at the company headquarters. Since that time his wife, Jane C. Willhite, has run the company as CEO.
Programs are held in many locations in the U.S., Canada, Japan and Indonesia with 12 PSI offices in major cities throughout North America.