From award-wining photographer Michael Brennan comes a book highlighting his extensive archive of powerful and sometimes very moving images from the world of boxing. They Must Fall: Muhammad Ali and the Men He Fought features images of not only Ali, the 'Greatest of All Time', but also of the men he fought in the ring. Brennan located former opponents for a special feature that ran over several pages in Sports Illustrated, to discover for himself where these great athletes ended up.