Joel Engardio explains the beliefs and practices of Jehovah's Witnesses for Engardio is speaking as an expert and journalist. He is not one of Jehovah’s Witnesses. The series of interviews was produced in association with the award-winning PBS documentary film Knocking, which was directed by Engardio. Knocking was named Best Documentary at the 2006 USA Film Festival. The video interviews are from May 2007. Knocking was nationally broadcast on the PBS series Independent Lens in May 2007.