That was Federal Reserve Chairman Ben Bernanke’s vow as the worst financial panic in more than fifty years gripped the world and he struggled to avoid the once unthinkable: a repeat of the Great Depression. Brilliant but temperamentally cautious, Bernanke researched and wrote about the causes of the Depression during his career as an academic. Then when thrust into a role as one of the most important people in the world, he was compelled to boldness by circumstances he never anticipated.