Leifer had taken that ringside spot in Lewiston, Maine, on May 25, 1965, as 23-year-old heavyweight boxing champion Muhammad Ali squared off against 34-year-old Sonny Liston, the man he’d snatched the title from the previous year. One minute and 44 seconds into the first round, Ali’s right fist connected with Liston’s chin and Liston went down. Leifer snapped the photo of the champ towering over his vanquished opponent and taunting him, “Get up and fight, sucker!” Power­ful overhead lights and thick clouds of cigar smoke had turned the ring into the perfect studio, and Leifer took full advantage. His perfectly composed image captures Ali radiating the strength and poetic brashness that made him the nation’s most beloved and reviled athlete, at a moment when sports, politics and popular culture were being squarely battered in the tumult of the ’60s. (Photo credit: Neil Leifer).