Videotaped oral history interview with Dr. David W. Mantik. A former assistant professor of physics at the University of Wisconsin and associate professor of radiation sciences at Loma Linda University, Mantik became an assassination researcher in 1991 and has studied the president's autopsy photographs and X-rays as well as the Zapruder film. Mantik has contributed essays to several books, including "Assassination Science" (1998) and "The Great Zapruder Film Hoax" (2003).Interview conducted at The Sixth Floor Museum at Dealey Plaza on November 20, 2009 by Stephen Fagin. The interview is forty-three minutes long.