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World heavyweight boxing champion Cassius Clay (later Muhammad Ali) signs an autograph for two year-old Shelley Obermuller from Acton, during a training session at the Territorial Army Gymnasium at White City, London, 17th May 1966. Clay is in London for his upcoming title defence against British champion Henry Cooper. (Photo by Central Press/Hulton Archive/Getty Images)

World heavyweight boxing champion Cassius Clay (later Muhammad Ali) signs an autograph for two year-old Shelley Obermuller from Acton, during a training session at the Territorial Army Gymnasium at White City, London, 17th May 1966. Clay is in London for his upcoming title defence against British champion Henry Cooper. (Photo by Central Press/Hulton Archive/Getty Images)