An instructor in surgery at Parkland Memorial Hospital in 1963, McClelland participated in the treatment of President Kennedy in Trauma Room One. He also assisted in the surgery of Gov. John Connally and, less than two days later, the treatment of Lee Harvey Oswald. Frequently interviewed over the years, McClelland continues to research and speak on the subject. Recorded July 16, 2001, February 10, 2011, and September 24, 2013.