Bob Larson is an American author, radio host, and pastor known for his work in the field of exorcism and deliverance ministry. He has written several books on the topic of spiritual warfare, including titles like "Larson's Book of Spiritual Warfare" and "Larson's Book of World Religions and Alternative Spirituality." Larson has been a prominent figure in the evangelical Christian community, and his approach to exorcism has often been controversial. He has hosted talk shows and made numerous media appearances, claiming to perform exorcisms both in person and over Skype. Despite skepticism from some corners, Larson has maintained a following and continues his ministry to those he believes are afflicted by demonic possession.