Jackett, who has been involved in a number of promotional campaigns during his career, previously led Millwall back to the Championship in 2010.
Jackett began his coaching career at Watford where he had several coaching roles. In June 1996 he became manager at Vicerage Road replacing Graham Taylor, who became Director of Football. He then reverted to assistant manager the following season, with Taylor once again becoming manager.
Jackett assisted Taylor in getting Watford promoted two seasons in a row, and helped the club during their 1999-2000 Premier League campaign.
After Watford, Jackett joined Ian Holloway at Queens Park Rangers as assistant manager and contributed towards their Division Two promotion campaign.
After 3 years as an assistant, Jackett left QPR to replace Brian Flynn as manager of Swansea in April 2004. In his first full season in charge, they were promoted from League Two, finishing in third place. The club also won the FAW Premier Cup.
A fine start to the 2005-06 League One campaign followed, where Swansea would eventually finish the season in sixth place - qualifying for the promotion play-offs, which they lost on penalties in the final against Barnsley. Success came that season as Swansea won the Football League Trophy, as well as winning the FAW Premier Cup for the second season in a row.
On 15 February 2007 Swansea parted company with Jackett by mutual consent after almost three years in charge.
In March 2007 Jackett was appointed reserve team manager of Manchester City. He was interviewed for the vacant managerial post at League One side Millwall, after the departure of Willie Donachie, and was confirmed as their new manager in November 2007.
On 2 October 2008 he was named Coca-Cola Football League One Manager of the Month after guiding Millwall to 5 consecutive wins. He led his side to 5th place finish and the play-off final in the 2008/09 season, narrowly missing out on promotion to Scunthorpe United.
The following season Millwall, would again reach the play-off final at Wembley after narrowly missing out on automatic promotion to Leeds United. This time they would go one better than the previous year by beating Swindon 1-0, which secured Millwall's first ever promotion via the play-offs.
Millwall would then enjoy a successful return to the npower Championship, as Jackett's men were in play-off contention throughout the 2010/11 campaign.
In the 2011/12 season, Jackett received the manager of the month award for April as Millwall had a strong finish to the season, going seven games unbeaten, which also included five wins in a row.
More success was to follow in 2012/13 as Jackett guided the club to The FA Cup semi-final at Wembley and he once again retained their Championship status. He remained with Millwall until May 2013 and at the time he was the 6th longest serving manager in English football.
In his first season at Wolves, Jackett secured their promotion back to the Sky Bet Championship whilst securing a new club record for points in a season in the process, beating the 92 picked up in winning Division Three in 1988-89. In addition, his side also set another club record for clean sheets in a season in their title winning campaign.
These achievements resulted in Jackett being awarded the Sky Bet Football League 1 Joint Manager of the Year alongside Leyton Orient manager Russell Slade at the League Managers Association 22nd Annual Awards Dinner 2014.
As a player, Jackett was capped 31 times for Wales, and he spent his entire playing career at Watford, before his career was ended by injury.
During the 1980s he helped the team to a runners-up spot in Division One, as well as appearing in the 1984 FA Cup Final.
He is also a graduate of the LMA's Certificate of Applied Management at Warwick University.