As "Percey" in the 1900 census. Grave marker has birth year as 1885.
The 1935 Bar Harbor, Maine city directory lists:
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