Sierra Ditson "Crystal" Moselle (born August 1, 1980) is an American filmmaker. Her debut film was The Wolfpack (2015), a documentary on the Angulo brothers. She has also made That One Day (2016) and Skate Kitchen (2018).
Born Sierra Ditson Moselle, in San Francisco, she attended Tamalpais High School in Mill Valley, California, graduating in 1998. She graduated from the School of Visual Arts in New York City.
In 2010 Moselle was walking around New York City, where she worked and lived, when she was struck by six brothers with an unusual appearance. Introducing herself to them she began bonding over their shared love of movies. She began filming them and after a year learned that they had spent the majority of their lives stuck in a small four bedroom apartment due to their abusive father's paranoia of the outside world…Read more on Wikipedia