Kleinert shot his first documentary film Living It while he was a member of the US Freestyle Ski Team. Living It was awarded "Best New Film" at the 1994 International Ski Film Festival in Crested Butte, Colorado.

While studying film and theatre at the University of Utah and with his athletic background, Kleinert landed jobs as an actor and stuntman in national television shows and feature films. It was then that Kleinert joined the Screen Actors Guild. Kleinert's acting and stuntman career was cut short, however, by a devastating stunt accident in 1996. So Kleinert found himself behind the camera again.

Kleinert began documenting environmental activism, American Indian Elders and the Spirit Riders from 1996 to the present day. After eight years of filming and over 300 hours of footage, Kleinert releases his feature documentary film Spirit Riders - Riding to Mend The Sacred Hoop.

Kleinert has also produced Athlete Profiles featuring top Olympic athletes, Passage to Tahiti, The Mike Larson Story, Wyoming Wranglers, Clouds & 4R Ancestors (Music Videos) and is currently in production on Horse Medicine, a feature-length documentary film.