[1] Before acting in films, Mulhall worked in legitimate theater, musical comedy, and vaudeville.

[1] During the silent era, Mulhall was a popular screen player, particularly in the 1920s, and he starred in such films as The Social Buccaneer, The Mad Whirl and We Moderns.

[1] During the peak of his success in films, Mulhall bought "large land holdings in what is now Sherman Oaks in the San Fernando Valley.

[3] In 1979, Mulhall died from congestive heart failure[4] at the Motion Picture & Television Country House and Hospital in Woodland Hills, California.

[5] For his contributions to the motion picture industry, Mulhall received a star on the Hollywood Walk of Fame at 1724 Vine Street.