By By George Dohrmann with David Epstein

This story appears in the June 6 edition of Sports Illustrated. To purchase a digital version of the magazine, go here.

The character traits that have made Jim Tressel a successful football coach and a beloved figure in Ohio are numerous and frequently cited. Former NFL coach Tony Dungy has praised Tressel's "integrity" and said he is the kind of man you'd want your son to play for. Eddie DeBartolo, the former 49ers owner, has said that Tressel's "steady" demeanor and knack for relating to young men reminded him of Hall of Fame coach Bill Walsh.

Tressel has often been described as senatorial, an adjective rarely applied to a football coach; in fact, one of his nicknames is the Senator. He has been lauded for his sincerity and his politeness, and people who admire his faith in God often mention the prayer-request box on the desk in his office at Ohio State.

The 58-year-old Tressel benefited from the fertile recruiting grounds of Ohio, but supporters always believed he got the most out of players because he was -- as the title of a 2009 book about him declares -- More Than a Coach. Under Tressel, the Buckeyes often sat together before meetings or at the start of practice for 10 minutes of "quiet time" to read about virtues such as humility, faith and gratitude. Tressel liked to say that his teams "play as hard as we can play" but also "respect as hard as we can respect."

Yet while Tressel's admirable qualities have been trumpeted, something else essential to his success has gone largely undiscussed: his ignorance. Professing a lack of awareness isn't usually the way to get ahead, but it has helped Tressel at key moments in his career. As coach at Youngstown (Ohio) State in the mid-1990s, he claimed not to know that his star quarterback had received a car and more than $10,000 from a school trustee and his associates -- even though it was later established in court documents that Tressel had told the player to go see the trustee. In 2003, during Tressel's third season in Columbus, Buckeyes running back Maurice Clarett was found to have received money and other benefits. Even though Tressel said he spent more time with Clarett than with any other player, he also said he did not know that Clarett had been violating the rules. A year later an internal Ohio State investigation (later corroborated by the NCAA) found that quarterback Troy Smith had taken $500 from a booster. It was the second time the booster had been investigated for allegedly providing improper benefits to a star player, but again Tressel said he had no knowledge of the illicit payment.

On Monday -- after months of turmoil during which he had first claimed to be unaware of violations in his program and then acknowledged that he had known about them -- Tressel resigned. (He had four years left on his estimated $3.5 million-a-year contract.) In his 10 seasons Tressel was the most successful coach in Columbus since Woody Hayes, having led the Buckeyes to three BCS title games, the 2002 national championship, a 9-1 record against Michigan and a winning percentage of 82.8%. But like Hayes, who was fired after hitting a Clemson player during the 1978 Gator Bowl, Tressel exits ignominiously, all of his many accomplishments tarnished. "After meeting with university officials, we agreed that it is in the best interest of Ohio State that I resign as head football coach," Tressel said in a statement. "The appreciation that [my wife] Ellen and I have for the Buckeye Nation is immeasurable." The school named Luke Fickell, 37, as interim coach for the 2011 season. The team's co-defensive coordinator and assistant head coach, Fickell is a Columbus native who played for Ohio State from 1992 to '96.

Tressel's most recent troubles began in December, when the Department of Justice, passing along information it had gathered in a raid while investigating the owner of a Columbus tattoo parlor for drug trafficking, informed Ohio State that at least six current players, ­including quarterback Terrelle Pryor, had traded team memorabilia for tattoos or cash at the parlor. When those revelations became public, Tressel said he hadn't known what the players had done and expressed disappointment that they had not listened to what he called the "little sensor" inside them that knew right from wrong. Four of Tressel's highest-profile players were found to have committed major NCAA violations, yet the coach's supporters insisted that those were isolated incidents outside his control.