What follows is information of past and present researchers who we owe a debt of gratitude to for the efforts they have given to further our knowledge of this amazing discovery....
1920`s Hereward Carrington Psychic Researcher begins experimenting.
1928 Thomas Edison worked on equipment he hoped would permit communication with the dead, using a chemical apparatus with potassium permangansate.
Thomas Edison was one of the greatest inventors who ever lived. He patented the incandescent light bulb, the carbon microphone, the phonograph, the motion picture projector, and a thousand other inventions. But few people know that Edison also was working on a machine that would be able to communicate with the dead. In an article in a 1921 issue of The Scientific American,
Edison wrote: "If our personality survives, then it is strictly logical or scientific to assume that it retains memory, intellect, other faculties and knowledge that we acquire on this Earth. Therefore, if personality exists after what we call death, it is reasonable to conclude that those who leave the Earth would like to communicate with those they have left here. I am inclined to believe that our personality hereafter will be able to affect matter. If this reasoning be correct, then, if we can evolve an instrument so delicate as to be affected by our personality as it survives in the next life, such an instrument, when made available, ought to record something." Although it was believed that Edison worked on a prototype for this invention until his own death in 1931, models or plans for this telephone to the afterlife were never found.
"Hell, there are no rules here - we're trying to accomplish something."
- Thomas Edison

1930`s The Scandinavian military pick up what was probably the first ever polygot messages. At the time believed to be German coded messages, which was later discounted.
1936 Attilz Von Szalay started to experiment with a Pack-Bell record-cutter and player, trying to capture paranormal voices on phonograph records.

1956 Raymond Bayless joined Attliz Von Szalay in experiments and wrote an article for the Journal of the American Society for Psychical Research in 1959.
1959 Swedish film maker Friedrich Jurgensen discovered strange voices whilst our recording bird sounds.
1964 Jurgensen after 5 years of research publishes his findings in his book Roesterna Fraen Rymden (Voices from the Universe). Attliz Von Szalay gets voices of his deceased relatives on tape for the first time.
1965 Dr. Konstantin Raudive, a Latvian psychologist and philosopher, visited Juergenson, concluded that the phenomenon was genuine, and started his own experiments in Bad Krozingen, Germany.
1967 Thomas Edison spoke through West German clairvoyant Sigrun Seuterman, in trance, about his earlier efforts in 1928 to develop equipment for recording voices from the beyond. Edison also made suggestions as to how to modify TV sets and tune them to 740 megahertz to get paranormal effects. (Session recorded on tape by Paul Affolter, Liestal, Switzerland). Franz Seidi, Vienna, developed the "sychophone". Theodore Rudolph developed a goniometer for Raudive's experiments.
1968 Father Leo Schmid, Oeschgen, Switzerland, was assigned a small parish to give him time to experiment with taping voices. His book, Wen Die Toten Reden (When the Dead Speak) was published in 1976, shortly after his death. Raudive published his book Unhoerbares Wird Hoerbar (The Inaudible Becomes Audible), based on 72,000 voices he recorded.

1970 Scott Rogo and Raymond Bayless publish 'Phone Calls From The Dead'. Raymond Cass begins experimenting.
1971 Colin Smythe, Ltd. England, published explained English translations of Raudive's book: Breakthrough, an Amazing Experiment in Electronic Communication with the Dead. Marcello Bacci and co-workers in Grosseto, Italy, made weekly contact with 'spirit' communicators, which still continued in 1988. William Adams Welch publishes his findings 'Talks With The Dead'. Paul Jones, George W Meek and Hans Heckman, Americans, opened a laboratory. First serious research to create a two-way voice communication system far more sophisticated than the equipment used in EVP approach.
1972 Gilbert Bonner, a dedicated researcher who amassed a huge collection of voices during his lifetime, begins experimenting. Peter Bander, England, wrote Carry on Talking, published in US as Voices From the Tapes
1973 Josephand Michael Lamoreaux, Washington State, had success with recording paranormal voices after reading Raudive's book.
1975 Formation of V.T.F German research group. William Addams Welch, Hollywood script writer and playwright, authored Talks With the Dead.

1978 William O'Neil working for George Meek, using a modified side-band radio, had brief, but evidential contact with an American medical doctor said to have died five years earlier.
1981 Manfred Boden has unsolicited contact with communicators of non-human evolution via telephone and computer.
1982 The AA-EVP was founded although their roots go back to the 1970s, when their president, Sarah Estep, began hearing mysterious voices on her husband's TEAC reel-to-reel recorder. Estep concluded the recordings were made by spirits from the afterlife or alien beings living in a non-corporeal state.[2]
1982
George Meek made a trip around the world to distribute tape recordings of 16 excerpts of communications between William O'Neil and an American scientist who died 14 years earlier. He also distributed a 100-page technical report giving wiring diagrams, photos, technical data and guidelines for research by others.
"Now, you know this room is filled with radio signals, right? ...And you know that each signal remains distinct by its frequency. That's why this radio can tune separately to each signal... Well, all the spiritual universes -and there are hundreds of them- they're all sharing this space with our physical universe, like radio signals sharing this room."
George Meek
Hans Otto Koenig, West Germany, develops sophisticated electronic equipment, using extremely low beat frequency oscillators, ultra-violet and infra-red lights, etc.
Sarah Estep begins the American Association of EVP (AA-EVP)
1984 Kenneth Webster, England, receives (via several different computers) 250 communications from a person who lived in the 16th century. Most print-outs are in English text consistent with speech at that point in history, and personal details fully supported by library research. Communications often concurrent with poltergeist-type phenomena. Webster writes book, The Vertical Plane, with extensive photo documentation in 1989.
1985 Klaus Schreiber, West Germany, with technical assistance from Martin Wenzel, begins to get images of dead persons on TV picture tubes, using opto-electronic feedback systems. There is positive identification in many cases by accompanying audio communications, including audio-video contact with Schreiber's two deceased wives. This work is the subject of a documentary TV film and a book by Rainer Hobbe of Radio Luxembourg.
1986 Jules and Maggie Harsh-Fischbach, Luxembourg, develop and operate two electronic systems superior to that of any of the EVP equipment up to this time.
1987 The C.E.T.L group formed, Luxembourg.
1989 Samuel Alsop publishes his book Whispers of Immortality.

1995 INIT formed (International Network for Instrumental Transcommunication, ITC)
2003 Scottish researcher Alexander MacRae made a number of attempts to capture EVP in a specially designed labratory belonging to the Institute of Noetic Science, Petaluma, California. The laboratory was described as being "double-screened"; Shielded against electromagnetic radiation; to prevent interference from radio transmissions or near by electronic devices, and insulated against sound; to prevent contamination of recordings by external noise sources. Over the course of the experiment, MacRae reported capturing a number of anomalies which were subsequently isolated and analyzed. Based on this analysis, and the level of screening against outside interference, MacRae concluded that the anomalies represented distinct speech from a source that could not be explained through conventional means.