John Mann was 35 when he was last seen in Philadelphia on December 1, 1997. At the time he was living in a halfway house in the city. He is described as a Caucasian male with brown hair and brown eyes, about 5 feet 7 inches tall and 170 pounds.

There are very few details about his last known movements, and he was not reported to police until April 5, 2001 — nearly four years after he was last seen. The Philadelphia Police Department lists his case as an endangered missing person and it remains open. The long delay before an official report and the scarcity of leads are central unresolved issues in this disappearance.

If anyone knew John, had contact with him around late 1997, or has information about the halfway house where he lived, please share what is known.