Gregory Glenn Robinson was 47 when he was last known to be in Phoenix, Arizona, on or around May 12, 2015. He is described as a white male, 5 feet 9 inches tall, about 250 pounds, with graying hair and brown eyes.

No official police investigation was opened until June 7, 2019, when the Phoenix Police Department began an active inquiry and entered his information into the National Missing and Unidentified Persons System under MP87879. Detective Daniel Nonnemacher is listed as the case contact. The delay between the disappearance and the report has not been explained publicly, and the case remains open.

If anyone knew Gregory, saw him in Phoenix around May 2015, or has information that could help investigators, please contact the Phoenix Police Department.