Bob Larson, born in 1944, was an American radio and television evangelist and pastor of Spiritual Freedom Church in Phoenix, Arizona. He authored numerous books that were critical of rock music and Satanism. Larson's early experiences as a musician reportedly fueled his concerns about occult and destructive influences within rock music, which he later integrated into his sermons. His preaching in the 1960s focused on what he perceived as leftist political ideology, sexually suggestive lyrics, Eastern religious mysticism, and anti-social behavior in rock musicians.

During the late 1980s and 1990s, a period known as the Satanic panic, Larson frequently engaged in debates and interviews with Satanists, including Nikolas Schreck and Zeena LaVey. He launched the call-in show "Talk Back" in 1982, which targeted teenagers and addressed topics like role-playing games and rock music. By the late 1980s, his ministry increasingly involved performing on-air exorcisms, often focusing on Satanism and alleged Satanic ritual abuse. Larson also offered exorcisms via Skype starting in 2014.

Bob Larson's ministry evolved over time, with a significant focus on confronting what he identified as Satanic influences. In the late 1980s and 1990s, he actively debated and interviewed figures associated with Satanism during the Satanic panic era. Notable encounters included those with Nikolas Schreck and Zeena LaVey, where Larson attempted to convert them to Christianity without success. His radio program "Talk Back," launched in 1982, initially catered to teenagers with discussions on contemporary issues and music, but later incorporated on-air exorcisms, addressing topics such as Satanism and alleged ritual abuse. This practice of exorcism extended into his later career, with Larson notably performing exorcisms in Ukraine with his daughter and her friends, and later offering these services via Skype.

Larson's extensive writings and public discourse often centered on his critical stance towards rock music and various esoteric belief systems. He claimed his background as a musician informed his views on the perceived occult and detrimental elements within rock and roll. His early work, such as "Rock & Roll: The Devil's Diversion" (1967), set a tone for his subsequent books that explored themes of Satanism, cults, and the perceived dangers of popular music and New Age practices. His novels, like "Abaddon" and "The Senator's Agenda," also linked alleged Satanic ritual abuse to political corruption, reflecting a consistent theme in his work concerning the perceived infiltration of evil into society.

Larson authored a substantial number of books, many of which focused on his critiques of Satanism, cults, and the perceived negative influences of rock music on youth. His literary output included both non-fiction works and novels. Some of his novels, such as "Dead Air," "Abaddon," and "The Senator's Agenda," explored themes of Satanic ritual abuse and its alleged connection to political corruption. However, questions have been raised regarding the authorship of some of his fictional works, with allegations that "Dead Air" was largely ghost-written. Legal correspondence mentioned in the source suggests potential liability and claims for recognition or profit sharing from individuals involved in the writing process.