Dec. 23, 1963: Harbaugh was born in Toledo, the second son of Jack and Jackie Harbaugh.

1982: Enrolls at University of Michigan as a quarterback and redshirts that fall.

1984: Breaks his arm five games into the season, ending his season with 718 yards passing and three touchdowns.

1985: Leads the nation in passing efficiency while passing for 1,976 yards and 18 touchdowns. Leads U-M to a 10-1-1 season and a Fiesta Bowl victory over Nebraska.

1986: Leads Michigan to an 11-2 season, passing for 2,729 yards and 10 touchdowns. He also rushes for eight touchdowns. Finishes third in Heisman Trophy balloting and is named All-American.

Nov. 21, 1986: Guarantees a victory over Ohio State in annual rivalry. Five days later, he completed of 19 of 29 passes for 261 yards, as Michigan defeats Ohio State.

1987: Drafted No. 26 overall in first round of NFL Draft by Chicago Bears. Plays in six games as a backup to Jim McMahon. He will play for Bears until 1993.

1990: First year as starting quarterback for Bears. Plays in 14 games before his season ends with shoulder injury.

1991: Plays in all 16 games, passing for 3,121 yards and leading Bears into playoffs, where they would lose in wild-card round.

1994-2001: While still in the NFL, he serves as an unpaid assistant at Western Kentucky, where his father is coach.

1994: Signs with Indianapolis Colts, where he will play until 1997.

1995: Named NFL's co-comeback player of the year and leads Colts to AFC Championship Game before losing to Pittsburgh after his Hail Mary pass in the end zone is dropped.

1998: Signs with Baltimore Ravens, where he plays one season.

1999: Signs with San Diego Chargers, where he plays two seasons.

2001: Signs with Lions in the offseason but is released before the regular season begins. Signs with Carolina, but doesn't play, and retires later that season.

2002-03: Becomes quarterbacks coach for Oakland Raiders. Oakland reaches Super Bowl XXXVII, where it lost to Tampa Bay. Quarterback Rich Gannon is named the MVP of the 2002 season.

2004-06: Head coach for University of San Diego. After a 2-4 start, wins 18 straight games and compiles three-year record of 29-6. Wins two Division I-AA national titles.

Dec. 19, 2006: Takes Stanford head coach job.

Oct. 6, 2007: In his first season as coach, after taking over a 1-11 team, Stanford upsets No. 1-ranked USC, 24-23.

2010: Stanford completes 12-1 season by defeating Virginia Tech, 40-12, in the Orange Bowl. Team is led by Heisman Trophy finalist quarterback Andrew Luck, who is drafted No. 1 in the following spring's NFL Draft.

Jan. 7, 2011: Takes San Francisco 49ers head coach job.

2011: In his first season, 49ers reach the NFC Championship Game and compile 13-3 record. He is awarded Associated Press Coach of the Year.

Oct. 16, 2011: After game against Lions at Ford Field, Harbaugh raises the ire of Lions coach Jim Schwartz after his animated handshake and back slap after 49ers' 25-19 victory. Schwartz reacts defiantly and chases Harbaugh off the field.

2012: 49ers go 11-4-1 and reach the Super Bowl before losing 34-31 to the Baltimore Ravens, who are coached by Jim's brother, John. During the season, Jim Harbaugh chooses to keep Colin Kaepernick as the starting quarterback after incumbent starter Alex Smith returns from concussion.

2013: 49ers finish regular season 12-4 and reach third consecutive NFC Championship Game before losing to Seattle.

2014: Reports surface of discontent between Harbaugh and front office management. The 49ers finish 8-8 and miss playoffs for first time in Harbaugh's four years as coach.

Sunday: Harbaugh and 49ers agree that Harbaugh will resign as coach.

Monday: Harbaugh agrees to become Michigan's football coach.

Tuesday: Harbaugh is introduced as new coach at news conference and Michigan's home basketball game.