1952: Born Kilrea in Northern Ireland, March 1.
1971: Makes international debut as a substitute against the USSR. Joins Nottingham Forest from Distillery in October.
1978: Member of Forest's league and League Cup double-winning side.
1979: Wins a second League Cup winner's medal as Forest retain trophy with 3-2 victory over Southampton.
1980: Wins European Cup as Forest beat German champions Hamburg 1-0 in Madrid.
1981: After 285 league appearances for Forest, with 48 goals, joins Norwich in February for the first of two spells as a player at Carrow Road. After 11 league appearances and one goal transfers to Manchester City.
1982: Returns to Norwich in January after playing just 13 league games for City. Makes 55 league appearances, scoring 11 goals.
1983: Returns to Nottingham in August, joining Notts County, making 64 league appearances with five goals.
1984: Wins last of 64 international caps in 2-1 win over Finland.
1990: Appointed manager of non-league Wycombe after spells with Stamford and Shepshed Charterhouse.
1991: Guides Wycombe to victory in the FA Trophy.
1993: Wycombe win GM Vauxhall Conference, securing promotion to the Football League. Clinches another FA Trophy success.
1994: Leads Wycombe to promotion from Division Three at the first attempt.
1995: Becomes manager of Norwich in June.
Resigns on December 17 after a series of clashes with chairman Robert Chase over money for team building. Appointed manager of Leicester on December 21.
Guides Leicester to ninth-place finish in Premiership.
1998: Finishes 10th in Premiership with the Foxes but O'Neill frequently voices concern over lack of funds.
1999: Leads Leicester to Worthington Cup final, where they are beaten by Tottenham, and to 10th place in the Premiership.
2000: February - Leads Leicester to another Worthington Cup win as they defeat Tranmere 2-1 at Wembley.
June 1 - Becomes Celtic manager.
2001: March - Wins first trophy in Scotland with a 3-0 CIS Insurance Cup final victory over Kilmarnock.
April - Celtic win Scottish Premier League title.
May - Beat Hibernian 3-0 to win Scottish Cup final and complete a domestic treble.
2002: April - Celtic secure the Scottish Premier League title again with a 5-1 win over Livingston.
2004: April 18 - Regains SPL title with 1-0 win at Kilmarnock with six games to spare.
May 22 - Earns second double in four years with 3-1 win over Dunfermline in Scottish Cup final.
July - Delays arrival in America for pre-season trip to care for sick wife, Geraldine.
2005: May 22 - Two late goals see Celtic lose 2-1 at Motherwell - and O'Neill's hopes of a fourth title in five years disappear as Rangers win 1-0 at Hibernian.
May 25 - Club announce O'Neill will step down after Scottish Cup final.
July 4 - Confirmed as manager of Aston Villa.
2007: May - Villa finish 11th in Premier League.
Following departure of Steve McClaren rules himself out of England job.
2008: May - Villa finish sixth in Premier League.
2009: May 2 - Villa finish sixth again, a run of nine games without a win costing them Champions League place.
August 27 - Fails to take Villa to the group stages of the Europa League following a 2-2 aggregate draw with Rapid Vienna. Rapid progress on away goals.
2010: February 28 - Reaches his first final with Villa - but they lose the Carling Cup 2-1 to Manchester United.
April 10 - Villa lose 3-0 to Chelsea in the FA Cup semi-final.
May - Villa finish sixth in the Premier League for a third successive year.
August 9 - Villa announce O'Neill has resigned as manager with immediate effect.
2011: November 18 - Rules himself out of the Northern Ireland manager's job, but agrees to help find the new man.
December 3 - Appointed manager of Sunderland, the team he supported as a boy, on a three-year contract.
Leads Sunderland away from trouble by guiding them to a 13th place finish in the Premier League.
2013: March 30 - Leaves Sunderland after a 1-0 home defeat against Manchester United leaves the team one point above the relegation zone
November 5: Appointed new Ireland manager