Alexander Koch is an American actor. He played the series regular role of Junior Rennie on the CBS drama series Under the Dome, based on the novel by Stephen King. He currently resides in Los Angeles.
Koch was born in Grosse Pointe Park, Michigan, to Joseph and Joya Koch. He is of Italian, German and Lebanese heritage. Koch has two older sisters, Ashleigh and Michelle. His father is late Wayne County assistant prosecutor Joseph Koch, a talented attorney who took on some of Detroits most notorious criminals in court. It was kind of my first introduction into acting, because I would go to the courtroom with him and watch him work, recalls Koch of his dad, who died in 2001. When he was presenting cases and whatnot, it was almost as if he was doing monologues.