 Trosper also served on the Grand Teton National Park Foundation Board from 2004 to 2008.In the past he has served on the Chief Washakie Sculpture Committee that dedicated a sculpture in the United States Capitol Rotunda in 2000, the Board of Directors of the Wind River Youth Council, and the Fremont County Historic Preservation Commission.Trosper was appointed by Governor Sullivan to the Wyoming Indian Affairs Council and served as the Chairman.