Never has there been a president less content to sit still behind a desk than Theodore Roosevelt. When we picture him, he's on horseback or standing at a cliff's edge or dressed for safari. And Roosevelt was more than just an adventurer--he was also a naturalist and campaigner for conservation. His love of the outdoor world began at an early age and was driven by a need not to simply observe nature but to be actively involved in the outdoors--to be in the field. As Michael R. Canfield reveals in Theodore Roosevelt in the Field, throughout his life Roosevelt consistently took to...