Police are searching for a man who has been missing from his home in Buxton since Sunday (November 17).
Tim Frohwein, 48, was last seen at around 2pm.
He was wearing a ¾ length dark coat, pale blue shirt and brown jeans. He may be carrying a walking pole.
He has short dark hair and wears glasses.
Mr Frohwein is a serving member of Derbyshire Constabulary.
Police are becoming increasingly concerned for his well being because he is recovering from recent knee surgery.
Anyone who sees a man matching this description, or who has information as to his whereabouts, should call police on 101.