Mae Costello was born Mae Altschuk in Brooklyn, New York to Catherine (née Callender) and Lewis Altschuk (born 1855), a Bavarian immigrant.

[1] As a teenager, she began performing in stage productions in stock theater companies throughout the United States.

[2] Costello appeared in motion pictures beginning in the early 1910s, billed as Mrs. Costello, opposite such actors as John Bunny, Flora Finch, Wallace Reid, Florence Turner, Antonio Moreno, Bobby Connelly and Clara Kimball Young, as well as her husband and daughters.

In 1929, Costello died of heart disease and was interred at the Calvary Cemetery, East Los Angeles, California.

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