He's never managed anyone other than Wales (manager since 1999).
He played for Man Utd (1980-86), Barcelona (1986-88), Bayern Munich (loan, 1987-88), Man Utd (1988-95), Chelsea (1995-98), Southampton (1998-2000), Everton (2000), Blackburn (2000-2002). Wales (72 caps, 16 goals)
. He was a great striker for most of his career, but ended his career as a holding midfielder (I think). He scored 163 goals in 462 games for Man Utd.
This could easily have been discovered by going to Google and entering the words "Mark," "Hughes" and "career"...
http://www.manutdzone.com/legends/flyinghughes.jpg