Gary Mack, curator of The Sixth Floor Museum in Dallas, and a nationally known authority on the assassination of President John F. Kennedy, has died.
Mack made two important contributions to the JFK story.
Along with Mary Ferrell, Mack was the first to call attention to Dallas Police Department recordings made on November 22, 1963. Audio experts retained by the House Select Committee on Assassinations (HSCA) concluded that the recording contained sound impulses consistent with five shots fired in Dealey Plaza.
The National Academy of Scientists (NAS) disputed that finding, saying that the impulses cited by the HSCA had been recorded after the assassination. The NAS did not explain what caused the unique pattern of sound impulses found by the audio experts, leaving the recordings validity as evidence unresolved.
In 1991 Mack played a leading role in debunking a sensational but unfounded conspiracy theory involved a Dallas Police Department officer named Roscoe White.