His father Thomas died while repairing a blast furnace at Andrew Carnegie's Union Iron Mill when Maurice was just five months old."[3]Costello joined Vitagraph, being a member of the first motion picture stock company ever formed, playing opposite Florence Turner.[4] Costello was one of the world's first leading men in early American cinema, but like a lot of other silent screen stars, he found the transition to "talkies" extremely difficult.While his leading man status was largely lost, Costello continued to appear in movies, often in small roles and bit parts, right up until his death in 1950.Maurice Costello also discovered Moe Howard of the Three Stooges, who, as a teenager, ran errands and got lunches for the actors at the Vitagraph Studios at no charge.