Robert Filipiak was last seen at around 7.20am on Wednesday, 18 May 2016 in Hartlepool.
Cleveland Police has conducted extensive enquiries and has widened its appeal, as officers believe he could have travelled to North Yorkshire.
Since Cleveland Police’s last appeal there have been no confirmed sightings of Mr Filipaik nor any contact with his family, which is highly unusual, and officers are increasingly concerned for his welfare.
Mr Filipaik, who is in his 50s, was last seen wearing a grey jacket, checked white and yellow shirt, blue jeans and brown shoes. He is described as 5ft 7ins tall, medium build and has brown eyes.
Anyone with information is asked to call 101, select # and then select Cleveland Police from the voice menu.