What 45th head of state and head of government of the United States, is associated with a parish church of the Episcopal Diocese of New York?
St. James Episcopal Church (Hyde Park, New York):  The church is associated with Franklin Delano Roosevelt, the 32nd President of the United States, whose family estate is located 2.7 miles south of the church. President of the United States: The President of the United States (informally referred to as "POTUS") is the head of state and head of government of the United States.
Franklin Delano Roosevelt