Larson was born in Westwood, Los Angeles, California, the son of Viola and Earl Larson. He was raised in McCook, Nebraska. Larson plays guitar; he has claimed his early experiences as a musician led to his concerns about occult and destructive influences in rock music. He would later incorporate his guitar playing into some of his sermons. In the 1960s, the focus of Larson's preaching centered mainly on the leftist political ideology, sexually suggestive lyrics, Eastern religious mysticism, and antisocial behavior of many of the era's rock musicians.
Debates with Satanists
During the late 1980s and into the 1990s, Larson repeatedly debated, interviewed, and confronted Satanists, during the period known as the Satanic panic. On two separate occasions he hosted Nikolas Schreck and Zeena LaVey. During their first encounter the pair defended Satanism, while in 1997, during their second appearance, they defended Setianism. Larson debated the pair, and at times attempted to convert them without success. Larson also debated, interviewed and challenged "Nazi Satanist" James Mason on his Talk-Back radio show
''Talk Back''
In 1982, Larson launched Talk Back, a two-hour weekday call-in show geared mainly toward teenagers and frequently focused on teen-oriented topics such as role-playing games and rock music. By this time Larson had come to embrace contemporary Christian music, including styles such as heavy metal and rap, and actively promoted the music and artists on his show. By the late 1980s, in what would come to define his later ministry, Larson was often heard performing exorcisms of callers on the air. The subjects of Satanism and Satanic ritual abuse were frequent topics of discussion. Death metal performer Glen Benton of Deicide became a regular caller, as did Bob Guccione Jr., eldest son of Penthouse founder Bob Guccione and founder of the music magazineSpin. At one point during the 1980s, Guccione Jr. paid Larson to go on tour with American thrash metal band Slayer and write about it. Larson tried his hand at writing fiction: Dead Air was largely ghost-written by Lori Boespflug and Muriel Olson. His later novels Abaddon and The Senator's Agenda both linked Satanic ritual abuse to political corruption; the latter was largely written by Larson and his second wife. However, a former vice president of Bob Larson Ministries, Lori Boespflug, said that much of Dead Air, though presented as Larson's work, is actually her own. Supporting these claims is a letter from Larson's lawyer that warns Larson of his "potential liability to Lori", anticipating that "the role Lori has played" would lead her to "demand recognition and/or profit participation" in respect to Dead Air and its sequels. In 2004, Larson returned to the radio airwaves after a two-year absence with a daily talk show heard on a network of radio stations and simulcast and archived on the Internet. Today, Larson remains active. His ministry professes to offer an alternative counseling outlet to people who have problems with violence, self-mutilation, multiple personality disorders, Satanic ritual abuse, or molestation.
Exorcism
In 2013 Vice magazine taped a video of Larson's visit in several small towns in Ukraine where he performed exorcisms together with three young women - his 18-year-old daughter Brynne Larson and her friends Tess and Savannah Sherkenback. The Teenage Exorcists consequently published a reply to Vice Media's video stating that they "question the journalistic integrity of this Vice Media story and are disappointed by how we were falsely portrayed." Larson offered to perform exorcisms over Skype. His Skype exorcisms were featured in a segment on the satirical program The Daily Show in 2014, in which he told correspondent Jessica Williams, “Skype is a great technology to stare down the Devil, to go after him and to kick him back to hell.” Later in the same segment, however, he indicated that "tweeting an exorcism would be ridiculous."