Michael Jonathan Zegen (born February 20, 1979) is an American actor. He is best known for his roles in the television series Rescue Me (2004–2011), Boardwalk Empire (2011–2014), and The Marvelous Mrs.

Maisel (2017–2023). Zegen was born to a teacher mother and a lawyer father, and lived in Glen Rock, New Jersey, before moving to nearby Ridgewood when he was five. He has two brothers.