Officers from Nottinghamshire Police are appealing to find Jan Gration, who has links to Heanor, Matlock and Buxton.
The 50-year-old was reported missing from the Eastwood area on Wednesday, April 14.
He is described as 5ft9in tall, with dark brown hair and is clean shaven.
If you have any information, call 101, quoting incident number 242 of April 27.
You can also call Crimestoppers anonymously on 0800 555 111.