He would later reprise the role in the show's spin-off series, Better Call Saul. For his role in Breaking Bad, Margolis received a nomination for a Primetime Emmy Award for Outstanding Guest Actor in a Drama Series. In January 2015, he portrayed Felix Faust in the Constantine episode 'Quid Pro Quo'. In addition, he has had recurring roles on numerous other TV shows, including The Equalizer, Quantum Leap, Oz, Law & Order, Crossing Jordan, Californication, and Breaking Bad.
In 1991, Margolis played Helmut Dieter in the soap opera Santa Barbara. Nel Apgar in an episode of the science fiction television series Star Trek: The Next Generation. Margolis is noted for his supporting roles in Scarface (1983) Ace Ventura: Pet Detective (1994), and the films of Darren Aronofsky: π (1998), Requiem for a Dream (2000), The Fountain (2006), The Wrestler (2008), Black Swan (2010), and Noah (2014). He was also later trained by Lee Strasberg and Barbara Loden. At age 19, he was a student under Stella Adler at the Actor's Studio.
Margolis was briefly a student at Temple University before dropping out and moving to New York City.
Margolis was born in Philadelphia, Pennsylvania, the son of Fanya (née Fried) and Isidore Margolis.
