Alexander Pollock Moore was an American diplomat, editor and publisher. He was publisher of the ‘Pittsburg Leader’ paper when he married stage actress Lillian Russell in 1912, becoming her fourth husband. Lillian semi-retired from the stage and they lived in Pittsburgh. After she died on June 6, 1922, he served as an ambassador to Spain and to Peru.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MS12-T85 : accessed 23 October 2017), Alexander P Moore, Precinct 7 Pittsburgh city Ward 14, Allegheny, Pennsylvania, United States; citing enumeration district (ED) 173, sheet 3B, family 50, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,241,360.