Stewart Knight, a 46 year old from Salford with links to Bath and Norfolk area, has been missing since Tuesday afternoon, 30 October.
He is white, of medium build with short, blonde hair. He could be wearing a dark coloured top and bottoms with a dark raincoat.
The 5ft 10in tall man left the Lowry theatre where he works at about 1pm and has not been seen since then.
The police are concerned for his safety.
Sergeant Clare Hall of GMP’s Salford Borough, said: “It’s not like Stewart to not have contact with anyone for such a long period of time and, as the hours go on, we’re getting more and more concerned for his safety.
Anyone who has seen or heard from Knight can get in touch with the local team on 0161 856 2836.