Robert Knepper

Robert Knepper portrays Sid Rothman, a mobster working closely with Mickey Cohen and Siegel; based on Cohen's hitman Harold "Harry" Rothman.

Early Life
Knepper was born in Fremont, Ohio, and raised in Maumee, Ohio, the son of Pat Deck and Donald Knepper, a veterinarian. He was interested in acting from an early age, due to his mother's involvement as a props-handler at a community theater, and after graduating from Maumee High School in 1977, he attended Northwestern University. During this time, Knepper also obtained professional roles in plays in Chicago. Nearing the completion of his degree, Knepper quit Northwestern and went to New York City, where he continued to work in theater.

Personal Life
Knepper has been married twice, once to Tory Herald in 2005. They divorced in 2009, and to Nadine Kary in 2013. Knepper has a son, Benjamin Peter (born 2002), from his first marriage.