Former midfielder who spent his club career with a number of teams, most notably Manchester City from 1987 to 1990 and Celtic FC from 2000 to 2007. In 2010, he became manager of Celtic FC until 2014; he'd manage the Boston Wanderers and Hibernian until returning to the Celtic in 2019.
He began his youth career at the age of 16 with Manchester City.
He coached Celtic FC to a Scottish Premier League title in 2011 and a Scottish Cup victory in 2010. He also played for the Northern Ireland national team from 1994 to 2002. I
He married Irene Lennon in 2008.
He and George Weah both played for Manchester City.