DENVER (CBS4) – Search and rescue crews are looking for a Denver teacher who was last seen in July.

Frank Stanley, 44, teaches gifted children on the University of Denver campus.

He went camping on July 25 in the Lost Creek Wilderness in Park County and hasn’t been seen since.

Stanley was reported missing on Thursday by his family.

His vehicle has been found but sheriff’s deputies say they have no clues to his whereabouts.