Craig Keener in his work, Miracles: The Credibility of the New Testament, mentions Dowie and Lake as healers extraordinaire. But many of their claims have been revealed to be cons, including in the end, conning themselves.
Con Man, John Alexander Dowie
John Alexander Dowie and the Invention of Faith Healing, 1882-1889
John Alexander Dowie invented a new form of faith healing spectacle in the 1880s that was substantively different to all previous forms of “Divine Healing.”