In the first of four compilations, Michael Parkinson looks back at some of his most memorable interviewing encounters. Parkinson's interviews with Muhammad Ali always made for compelling viewing. With both men at the height of their professions, and Ali regularly exhibiting the fierce intelligence which helped make him a great champion, this was the closest that interviewing could get to the excitement of the sporting arena. Here Parkinson looks back at his four meetings with the former world champion boxer, and charts the career of the man still regarded by many as the greatest of all pugilists.