Ken Regan made a name for himself as a boxing photographer in 1964, when he shot Cassius Clay's shocking defeat of Sonny Liston for SI. Since then Regan has captured the sport's greatest figures (clockwise from top left): Ali and Floyd Patterson; Joe Frazier and his Knockouts; George Foreman and Ali; Foreman and pal; Don King; Mike Tyson and trainer Cus D'Amato. Those shots and hundreds more are collected in Regan's Knockout: The Art of Boxing, to be published next month.

SIX PHOTOSKEN REGAN/CAMERA 5 PHOTOPALACE PRESS INTERNATIONAL (BOOK)