Bill Walsh checks in at No. 2 on ESPN's list of Greatest Coaches in NFL History, leaving the as-yet-unnamed Vince Lombardi as the obvious No. 1.

Walsh, of course, led the San Francisco 49ers to three of their five Super Bowl victories. He revived the franchise with a blueprint that became standard operating procedure across the league. He blazed trails in minority hiring and produced a coaching tree with branches still growing in the game today.

I highly recommend checking out Seth Wickersham's piece on Walsh from January. Wickersham focused on the coaching guide Walsh wrote.

"[Bill] Belichick once referred to it as football 'literature,' but it's more like a textbook -- 550 pages, 1.8 inches thick, 3.2 pounds, loaded with charts, graphs and bullet points," Wickersham explained. "For example, Walsh includes 57 keys to negotiating contracts ('The negotiator's need for food and sleep can affect his/her ability to function effectively'), 13 pages of sample practices and 108 in-game scenarios."

The video above features Walsh's own thoughts on characteristics great coaches possess. Unpredictability on and off the field is one of them.

The chart below shows won-lost-tied records and number of championships won for the top 20 coaches on ESPN's list, courtesy of Pro Football Reference. The winning percentages listed reflect victories plus one-half ties, divided by total games. For Walsh, that works out to 92.5 victories divided by 152 games, or .609.

Records for ESPN's 20 Greatest NFL Coaches