BBC: Most guests come into the HARDtalk studio with their guard up, their defences prepared. Dr Allen Ault simply faced the cameras and bared his soul.
His account of supervising executions in the US state of Georgia was one of the most painful, searingly honest and courageous testimonies I have ever heard.
Dr Ault is a soft-spoken Midwesterner with steel-grey hair and a steady gaze.
As he spoke about his years as corrections commissioner for the US state of Georgia, he appeared to forget the artifice of the TV studio and relive his experiences in the execution chamber.
"I still have nightmares," he told me.
"It's the most premeditated form of murder you can possibly imagine and it stays in your psyche for ever." » | Stephen Sackur | HARDtalk | Sunday, February 23, 2014