Mark Margolis (/mɑːrˈɡoʊlɪs/; born November 26, 1939) is an American actor. He is known for playing Alberto "The Shadow" in Scarface, Antonio Nappa in Oz, and Hector Salamanca in Breaking Bad and Better Call Saul. His performance in Breaking Bad was nominated for an Emmy Award in 2012. He regularly performs in the films of Darren Aronofsky, appearing in all but two of his films, and starring in his first film Pi (1998).

Early life
Margolis was born in Philadelphia, Pennsylvania, the son of Fanya (née Fried) and Isidore Margolis. He is from a Jewish family.

Margolis was briefly a student at Temple University before dropping out and moving to New York City. At age 19, he was a student under Stella Adler at the Actors Studio. He was also later trained by Lee Strasberg and Barbara Loden.