From Wikipedia, the free encyclopedia. Joseph Mascolo (born March 13, 1929) is an American musician and dramatic actor. During his long career, he has acted in numerous motion pictures and television series. He is best known for playing Stefano DiMera, a role he originated in 1982 on NBC's long running Days of our Lives. Description above from the Wikipedia article Joseph Mascolo, licensed under CC-BY-SA, full list of contributors on Wikipedia