David Marler has researched the UFO subject for 30 years. He joined MUFON in 1990 as a Field Investigator Trainee & went on to become the State Section Director as well as the Illinois State Director.
He has assisted the History, Learning, Discovery, Science & Smithsonian channel on UFO documentaries over the years in addition to independent productions.
He has one of the largest personal libraries of UFO books, journals, magazines, newspapers & case files from around the world that cover the last 75+ years. He uses them in his research & shares a good bit of information on his website, http://www.davidmarlerufo.com