The quarterback is the most celebrated and scrutinized position in American team sports. Major passing statistics only tell part of the story of a QB. The player under center is also heavily credited or faulted with the wins and losses of his team. Quarterbacks whose teams achieve championships are often given priority in these greatest-ever discussions. This list, however, will largely be determined by their approximate value (AV) – a regular season statistic. Although football stat lines do not capture all the contributions of a player the way they do in baseball and basketball, approximate value is a regular season-only statistic that attempts to attach a single number to every player since 1960. With that considered, here are the 25 best quarterbacks of all time in alphabetical order.