Tarrant was a founding partner in the production company Candescent Films, which was started in 2010 to produce and finance documentary films exploring social issues. With Candescent, Tarrant was an executive producer on films including "Sons of the Clouds", narrated by Javier Bardem, which premiered at the 2012 Berlin International Film Festival and won the 2013 Goya Award for Best Documentary Film; "The Queen of Versailles", which won the 2012 Sundance Film Festival U.S. Directing Award for Documentary; "Who Is Dayani Cristal?" starring Gael García Bernal, which premiered at the 2013 Sundance Film Festival; and "Trophy", which premiered at the 2017 Sundance Film Festival and was acquired by CNN Films and The Orchard.