It's often said that catcher is the most important, most demanding defensive position in baseball. This view explains why so many light-hitting catchers have enjoyed long--and by all accounts successful--major league careers. Yet arguments over the all-time greats invariably privilege offensive standouts, and even among these players batting statistics are more likely than fielding numbers to affect ranking. So what, historically, have been the expectations for major league catchers, and who stands as the greatest in a more balanced view of offensive and defensive contributions? In Part I of...