Police are asking for public assistance to locate Robert Hay.
The 51-year-old was last seen at Wyoming at about 10pm on Sunday, November 13.
Hay is described as being of Caucasian appearance, about 173cm tall, of medium build, with brown hair.
He is known to frequent the Gosford, Sydney CBD, Artarmon and St Leonards areas.
Anyone with information into his whereabouts is urged to contact Crime Stoppers on 1800 333 000.
Source:
Brisbane Water Police District