William B. Mack was born on April 8, 1872 in Bay City, Michigan, USA as William Basil McGillicuddy. He was an actor, known for Backbone (1923), Missing Millions (1922) and The Steadfast Heart (1923). He was married to Gertrude O'Malley. He died on September 13, 1955 in Islip, Long Island, New York, USA.