The White House's most famous alleged apparition is that of Abraham Lincoln. One of Mumler's most famous photographs apparently shows Mary Todd Lincoln with the "ghost" of her husband, Abraham Lincoln. Paranormal researcher Melvyn Willin, in his book "Ghosts Caught on Film", claims that the photo was taken around 1869 (after Abraham Lincoln's death), and that Mumler did not know that his sitter was Lincoln, instead believing her to be a 'Mrs Tundall'. Willin goes on to say that Mumler did not discover who she was until after the photo was developed. The College of Psychic Studies, referencing notes belonging to William Stainton Moses (who has appeared in photographs by other spirit photographers), claim that the photo was taken in the early 1870s, Lincoln had assumed the name of 'Mrs. Lindall' and that Lincoln had to be encouraged by Mumler's wife (a medium) to identify her husband on the photo. Though the image has been dismissed as being accidental double exposure, it has been widely circulated.