From The Arthur Conan Doyle Encyclopedia
Fred Barlow (?-1964) was a paranormal photographer from Birmingham. He was secretary of the Society for the Study of Supernormal Pictures (S.S.S.P.) where Arthur Conan Doyle was vice-president. He was also Honorary Secretary of the Birmingham and Midland Society for Psychical Research (S.P.R.).
Barlow had a huge collection of psychic photographs which were inherited by E. J. Dingwall, which published in 1975 : "The Barlow collection of psychic photographs", and deposited them at the British Museum.
Fred Barlow and Arthur Conan Doyle
In 1922, Fred Barlow wrote the preface and chapter 8: Evidential and Scientific Aspects of Psychic Photography of Arthur Conan Doyle's essay: The Case for Spirit Photography.
In 1924, he was the Hon. Secretary for the donation campaign for Rev. G. Vale Owen launched by Conan Doyle. 
In his book The History of Spiritualism (1926), Conan Doyle mentioned Barlow: "In 1920 Mr. Fred Barlow, of Birmingham, a well-known investigator, obtained with this medium [photographs] extras of faces and written messages, under test conditions, on plates that were not exposed in the camera."
- Psychic Phenomena Are Real. A Reply to Mr. Nevil Maskelyne, by Fred Barlow (june 1923, The London Magazine)
- Arthur Conan Doyle's letter: The Future of the Rev. G. Vale Owen (31 may 1924).