Yellowstone English/Environmental Studies Program International LLC (YESPI) is a private American education company based in the center of the Greater Yellowstone Ecosystem (GYE).  YESPI designs and delivers university-accredited education programs for international and American students. 

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Since 2014, YESPI has hosted six education programs and two internship programs. For all courses and programs, the GYE, an area of land that is 20 million acres (8 million hectares) in size and includes Yellowstone National Park and Grand Teton National Park, is the outdoor classroom and laboratory.  YESPI’s education programs help students truly stand out while offering life-changing experiences.

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YESPI has offices in the USA, China, and Vietnam.