He seems a very serious man doing good work. I couldn't find any evidence of what you say.
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http://www.worldwisdom.com/public/authors/details.aspx?ID=192James Trosper is a respected voice on traditional Plains Indian spirituality. He is Medicine Man and Sun Dance chief of the Shoshone Tribe on the Wind River Indian Reservation in Fort Washakie, Wyoming. Mr. Trosper is a direct descendant of the great Eastern Shoshone chief, Washakie, and he comes from a long line of Shoshone Sun Dance chiefs that includes John Trehero, the Sun Dance chief who brought the Shoshone Sun Dance to the Crow tribe. Mr. Trosper is also part Arapaho.
Mr. Trosper has traveled throughout America, assisting in the continuation of American Indian religious traditions, and explaining the Sun Dance religion of the Plains and Indian spirituality to Indian and white audiences. He is also deeply involved in developing and promoting programs to preserve the Shoshone language and cultural heritage.
James Trosper is a director of the Chief Washakie Foundation, and a director of the Grand Teton National Park Foundation. He holds a degree from the University of Wyoming, where he is now a Trustee of the University.
Trosper, his wife, and their two children, live in Fort Washakie.
James Trosper has contributed the following to World Wisdom projects:
The "Foreword" in Indian Spirit (revised and enlarged edition)
Comments in the section "Conversations With Native Elders" in Native Spirit: The Sun Dance Way (book)
Videotaped interview in the section "Conversations With Native Elders" in Native Spirit and The Sun Dance Way (2-disc DVD set)
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Parts of the book can be read here.
http://books.google.co.id/books?id=zhTNlvAjIZUC&dq=%22james+trosper&printsec=frontcover&source=bl&ots=LNrzpgDSrb&sig=f2bso_9vuh2mYDE3SdWB-KYLycQ&hl=en&sa=X&oi=book_result&resnum=2&ct=resultAnother book he appears in with Looking Horse and other elders.
http://www.nativespiritinfo.com/james_t.htmlUniversity Trustee
http://uwadmnweb.uwyo.edu/trustees/info.asp?p=676http://www.windriverhistory.org/washakiefound.htmlJ"ames Trosper, Chair and Executive Director
James currently is a member of the Board of Trustees of the University of Wyoming and served as the Director of Indian Child Welfare for the Northern Arapaho Tribe for 14 years. He is also on the Award Committee of the Chief Washakie Memorial Endowment at the University of Wyoming and the Grand Teton National Park Foundation Board. In the past he has served on a number of boards including The Chief Washakie Sculpture Committee, the Board of Directors of the Wind River Youth Council, Fremont County Historic Preservation Commission and Wyoming Indian Affairs Council. He is also the great-great grandson of Chief Washakie."
This article is almost 20 years old, but seems to show Trosper once was a devout Mormon.
http://www.lds.org/ldsorg/v/index.jsp?vgnextoid=024644f8f206c010VgnVCM1000004d82620aRCRD&locale=0&sourceId=ae33d370d5c9b010VgnVCM1000004d82620a____&hideNav=1An account of how he became keeper of the tribe's bundle.
http://findarticles.com/p/articles/mi_qn4188/is_/ai_n11412273Summaries of his minutes of his meetings with Wyoming officials.
http://legisweb.state.wy.us/2004/interim/tribal/minutes/app0520.htmhttp://www.gtnpf.org/board.php"Grand Teton National Park Foundation
Board of Directors....
James Trosper lives in Fort Washakie, Wyoming and is Director of the Indian Child Welfare Legal Department on the Wind River Indian Reservation. In 2002, he was appointed by Governor Dave Freudenthal for a five-year term as trustee on the University of Wyoming board. James is an Eastern Shoshone Sun Dance leader and the great-great grandson of Chief Washakie."