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David is a professional member of the American Association for the Advancement of Science, the Audio Engineering Society, the International Frequency Sensor Association, and is also affiliated with the Institute of Electrical and Electronics Engineers. David began his research into the paranormal professionally in 1976, and has investigated cases scientifically from Rhode Island to Key West, Florida. His Book Paranormal Technology: Understanding the science of ghost hunting, hailed as a new paradigm in paranormal research and investigations techniques.