Most people think of Thomas Jefferson as the quintessential Renaissance president, while Theodore Roosevelt is remembered as a trust-busting empire builder. But, as H. Paul Jeffers shows, Roosevelt was a highly developed natural scientist, explorer, and the first real environmental president. As an avid outdoorsman, hunter, and associate member of Roosevelt’s own Boone and Crockett Club, I read Jeffers’ text with a feeling that I was at T.R.’s side.