1890 census states he was born Oct. 1889. His grave marker has the name as "Arthur M. O'Kief."
Private, U.S. Army, WWI
Arthur Kief residing on Shore Road
John Kief, an employee of Pine Tree Dairy, residing on Shore Road
Percy H. Kief (Tillie), proprietor of Pine Tree Dairy and President of Mt. Desert Island Dairies, Inc., residing on Shore Road