Justin Koehler's new film, "The Buffalo King," is a documentary of James "Scotty" Philip, one of South Dakota's most influential figures. Often described as the "man who saved the buffalo," Philip was also a study in turn-of-the-century United States History. Koehler is a Denver-based filmmaker who grew up in Midland, South Dakota. Private screenings of "The Buffalo King" will take place this weekend in Pierre and Philip.